The Formation of Christianity — Saint Paul, Saint John, Logos, and the Movement to Institution

Introduction — Why Understanding This Matters for Philosophy

Medieval philosophy stands on two pillars: the Greek philosophical tradition — reason developing from Thales through Aristotle and the Hellenistic schools — and the Judeo-Christian religious tradition — faith developing from Moses through the prophets and into the emerging Church. The two great medieval thinkers, Augustine of Hippo and Thomas Aquinas, devoted their intellectual lives to showing that these two pillars support rather than contradict each other.

A famous painting of Thomas Aquinas captures his position perfectly: he stands holding a church in one hand and a book in the other. The church represents faith; the book represents reason. He holds them together, in both hands simultaneously, because he believes they belong together. To understand this position — to understand why it was controversial, what problems it solved, and what problems it left unsolved — requires understanding how each of the two traditions actually developed. We have traced the development of reason. This lecture traces the development of faith: how a small Jewish reform movement became one of the world’s most influential religious institutions.

Table of Contents

1. The Universal Gap Between Founder and Religion

Before entering the specific history of Christianity’s formation, it is worth establishing a general principle that applies across all religious traditions, and indeed across all systems of thought.

Every founder has direct experience. The clarity that comes from that direct experience is not teachable in the ordinary sense — it cannot be transmitted like a set of propositions. The Buddha, having attained enlightenment, could describe what he had discovered; his followers, lacking the same experience, could understand his descriptions but not the experience itself. The result, across centuries, was the proliferation of Buddhist schools — Theravada, Mahayana, Vajrayana, and many others — each interpreting the Buddha’s teaching through different lenses, emphasising different aspects, and reaching different conclusions.

The universal gap: To fully understand a founder, you must have the same experience they had. ‘To understand the Buddha, you must become a Buddha.’ Until you reach that level, your understanding is interpretation — shaped by your own background, limitations, and perspective. This is not a flaw; it is an unavoidable consequence of the gap between direct experience and secondhand learning.

This principle applies equally to Christianity. Jesus had a direct experience of the divine — an immediate, unmediated contact with what he called his Father. His clarity arose from that experience. His followers had no such direct experience. They had memories, testimonies, feelings, and, in some cases, visions. But they did not have what Jesus had. The result was multiple interpretations — and eventually multiple theological schools — sometimes in genuine tension with each other.

2. The Two Views of Jesus — Political and Spiritual

During Jesus’s own lifetime, he was perceived in two fundamentally different ways, and this dual perception shaped everything that happened to him and to his movement.

The Spiritual Reading

Many of Jesus’s followers understood ‘the Kingdom of God is at hand’ as a spiritual message: God is calling for inner transformation; love, compassion, and humility are the way; the legal compliance that Judaism had evolved into was missing the point of the law’s own heart. These followers saw Jesus as a teacher, a prophet, a reformer — someone bringing God’s original message back to its proper centre. For them, the kingdom he was announcing was a moral and spiritual reality, not a political arrangement.

The Political Reading

Others heard the same words and drew different conclusions. If the Kingdom of God is arriving, does that not mean the end of Roman rule? Is Jesus not promising the political liberation that the Messianic prophecies had always pointed toward — the restoration of David’s era, the expulsion of foreign occupiers, the establishment of a free and sovereign Jewish state? For these followers, Jesus was not a spiritual reformer but a national liberator.

The Romans did not need to understand the distinction. When Jesus entered Jerusalem and was greeted by crowds welcoming him like a powerful leader, the Roman authorities registered one thing: this man has a popular following, and popular followings become political problems. They moved with speed and decisiveness. Jesus was arrested quietly, in the night, away from crowds. A fast trial followed — designed to minimise public attention. And then crucifixion: the most public, most degrading, most painful punishment in the Roman system. The message the Romans intended was unmistakable: do not challenge Rome.

3. The Three Foundational Events

Resurrection vs Resuscitation — A Critical Distinction

• Resuscitation: A person undergoes what appears to be clinical death — cardiac arrest, absence of breathing, loss of brain function — but is revived through medical or other intervention. They return to the same biological existence as before. They are alive again, but in the same mortal body, subject to the same biological limitations, and they will die again.
• Resurrection: An actual death — real, complete, irreversible in ordinary terms — after which the person is transformed into a fundamentally new kind of existence. They are not merely alive again; they are permanently beyond the reach of death. They cannot die again. Their existence has crossed a threshold from mortal to immortal. This is categorically different from resuscitation.

Christian theology claims Jesus underwent resurrection, not resuscitation. This distinction is essential: if Jesus merely revived from clinical death, his experience, while remarkable, would not be the basis for a theology of salvation. It is specifically because he permanently crossed the threshold from death into deathless existence that his experience becomes theologically foundational — the prototype and promise for what believers hope will happen to them.

The Effect of Resurrection on the Followers

Before the resurrection, Jesus’s followers were shattered. Everything they had hoped for seemed finished. The arrest, the trial, the crucifixion — these were not just tragic; they were apparently disqualifying. A Messiah who is crucified by the occupying power they were supposed to overthrow seems to have failed at the most basic level.

The resurrection changed everything. If Jesus had genuinely returned from death — not merely recovered but crossed into a new form of existence — then the crucifixion was not failure but something else entirely. And Jesus himself, over the forty days before the ascension, gave his followers a framework for understanding what that something else might be. The mission was not over. The Kingdom of God was still coming. And Jesus was not what they had thought — not merely a prophet or a teacher, but a divine person.

This conviction about Jesus’s divine nature, however, created an immediate and acute theological problem. Jesus himself had consistently focused attention on God — the Father — and on the ethical demand to love God and neighbour. Now his followers were focusing primarily on Jesus himself. The theological centre of gravity had shifted, and with it the entire character of the movement.

4. The Community Waiting — The Early Church

After the ascension, the followers of Jesus found themselves in a strange position: expecting the imminent arrival of God’s Kingdom, uncertain when it would come, and uncertain how to interpret everything that had happened. They responded by forming a community.

They lived together, shared their possessions, ate together, supported one another financially and practically. Jesus had become the central figure around whom this community organised itself. What had been a movement focused on God’s requirements had become a community focused on Jesus’s person.

Three questions pressed on them from the beginning:

• Why has the Kingdom not come? Perhaps the timing depends on human readiness; perhaps the world’s sinfulness has delayed it; perhaps ‘imminent’ means something different than they assumed.
• If Jesus was the Messiah, why did he accept death? The traditional Messianic expectation involved a conqueror, not a victim. Jesus had apparently known what was coming and had not resisted. This needed explanation.
• Is claiming Jesus’s divinity compatible with Jewish monotheism? To call any human being divine is, within strict Jewish theology, blasphemy — a category error at best, an insult to God at worst. This created immediate tension with the Jewish community from which the movement had emerged.

The last problem drove the movement outward. Strict Jerusalem Jews rejected the claim of Jesus’s divinity, and rejection there was sharp and hostile. But the Jewish Diaspora — Jews living throughout the Roman Empire in cities like Alexandria, Antioch, and Rome — had been shaped by prolonged exposure to Greek and Roman culture. They were more theologically flexible. And from them, the movement began reaching out to Gentiles — non-Jews — for the first time.

5. Saint Paul — The Architect of Christian Theology

No single person did more to shape Christianity as a formal theological system than Paul of Tarsus. Nearly half of the New Testament is his writing — thirteen letters addressed to communities he had founded or visited across the Roman Empire. To understand Christian theology is, to a very significant degree, to understand Paul.

Who Paul Was

Paul was a Jew born in a Greek city — Tarsus, in what is now southern Turkey. This dual background was decisive. He had a thorough Greek education and deep familiarity with the mystery cults that were such a prominent feature of Hellenistic religious life. He had also been sent to Jerusalem for advanced Jewish education, where he became an accomplished student of the law and a committed, proud Jew. He combined in one person the two cultural worlds — Greek and Jewish — that Christianity would need to bridge.

Jesus and Paul appear never to have met. Paul became aware of the Jesus movement from outside, as an observer and initially as an opponent. When he heard that a small community was claiming that a human being was divine, and organising itself around this claim, he was outraged. Within strict Jewish theology, this was blasphemy — the most serious possible religious offence. Paul joined with conservative Jewish groups and became, by his own account, the movement’s most active persecutor — pursuing, imprisoning, and reportedly being responsible for the deaths of early Christians.

The Damascus Road Vision

The conversion of Paul: Paul was travelling to Damascus to continue his persecution of the Jesus community there when he underwent an experience that transformed him completely. Something — he later described it as an encounter with the risen Jesus — stopped him in his tracks. He arrived in Damascus not as a persecutor but as a convert. Within days he was preaching Jesus as the Son of God. The cause of the experience has been interpreted in multiple ways: a genuine divine encounter, a medical episode (possibly temporal lobe epilepsy), extreme psychological stress producing a breakdown, or a hallucination from exhaustion. The lecturer’s focus is not on the cause but on the result — this single event reversed the trajectory of one of the most consequential lives in Western history.

What Paul did with this experience was shaped entirely by his background. He was steeped in the mystery cults — their narrative of a saviour god who dies and rises, whose death and resurrection the initiate participates in mystically, securing immortality. He saw immediately that Jesus’s story fitted this template. And he had the Jewish theological framework to make the connection systematic: Adam’s sin, God’s covenant, the prophetic tradition, the sacrificial system of the Temple. Paul fused these elements into a new synthesis.

Paul’s Core Theological Ideas

Paul’s Mind-Body Dualism — The Inner Conflict

Paul’s theology is grounded in a specific account of the human moral predicament — one that has proved both influential and philosophically contentious. He describes it from the inside, in the first person, with a psychological vividness that makes it immediately recognisable.

The inner conflict (paraphrasing Paul): I know what is right. My mind recognises God’s law and wills to follow it. But what I end up doing is not what I willed to do — it is the opposite. And what I do not want to do, I find myself doing. Sin has taken possession of my body. My will is attached to God; my body is attached to sin. And the body wins.

Anyone who has tried to stop smoking and found themselves reaching for a cigarette, or who intended to study and found themselves on social media, recognises the structure of this experience. Paul’s account is not exotic mystical speculation — it describes a genuine feature of human psychology. The will and the behaviour diverge; intention and action contradict each other.

For Paul, this divergence is not merely psychological — it is metaphysical. Sin has literally possessed the physical body, making it a power that overrides the spiritual will. And if the body is possessed by a power stronger than the individual will, then individual effort cannot be the path to salvation. No amount of trying harder, following rules more carefully, or self-discipline can free the person from this possession. The only solution is external: divine grace — God’s power intervening from outside to break the possession and free the will.

This is where Paul diverges most sharply from Jesus’s own teaching. Jesus, reading his ministry through the Jewish prophetic tradition, taught that inner transformation is within human capacity: open your heart, love God and neighbour, choose goodness — and this choice is available to every person. Paul’s account leaves no such room for human initiative. The choice itself is corrupted by the body’s possession. God must act first; the human being is the recipient of grace, not its initiator.

6. Judaism, Jesus, and Paul — Three Theological Positions

These three positions — Jewish law-observance, Jesus’s internal transformation, and Paul’s faith-and-grace theology — are not simply variations on a theme. They represent genuinely different understandings of the human condition, of what God requires, of how salvation works, and of who or what stands at the centre of the religious life. Reconciling them into a single coherent system was the central challenge of early Christian theology.

7. Philosophical Problems in Paul’s Theology

Paul was not a systematic philosopher, and his letters were written to address specific pastoral situations in specific communities — not to construct a comprehensive and internally consistent theological system. The result is that his theology, taken as a whole, raises a series of serious philosophical problems that subsequent Christian thinkers spent centuries attempting to resolve.

None of these problems is a reason to dismiss Paul’s contribution — they are an indication of how ambitious and how original it was. He was attempting to synthesise Jewish scripture, the extraordinary fact of Jesus’s life and resurrection, Greek mystery cult patterns, and universal ethical principles into a single framework accessible to people across the entire Roman Empire. That such an attempt would leave unresolved tensions is not surprising. What is remarkable is how much it achieved.

8. Saint John and the Logos Solution

A different solution to one of Christianity’s most pressing theological problems came from a writer identified as John — probably a Hellenistic Christian with a strong philosophical background. His contribution addressed what might be called the incarnation problem: if Jesus is divine, why and how did divinity take this particular human form?

The Incarnation Problem

Paul had established that Jesus was a divine saviour. But this raised an immediate question that Paul had not systematically answered: in what sense is Jesus divine? And more puzzlingly: why Jesus? Why did the divine choose this specific human being at this specific moment? What is the metaphysical connection between the infinite divine and this one finite person?

John’s Solution — The Logos

The opening of John’s Gospel: ‘In the beginning was the Word [Logos], and the Word was with God, and the Word was God. All things were made through him; without him nothing was made that has been made. The Word became flesh and dwelt among us.’

John’s move is philosophically brilliant. He does not say that Jesus — an ordinary human being — was elevated to divinity. He says that the Logos — a principle that existed from before creation, through which God created everything, and which is therefore entirely divine — chose to take human form. Jesus is not a human who became divine; he is the divine who became human.

• The pre-existence of the Logos: Jesus is not a new entrant into existence. The Logos has always existed — from before the world was made, as the divine principle through which God created.
• Logos as God’s agent in creation: The entire physical universe was made through the Logos. This is not a marginal figure who appeared at one moment in history; this is the power behind all of creation from the beginning.
• The Logos became flesh: This is the incarnation — the Logos taking human form. It is not an arbitrary choice of a random human being; it is the eternal divine principle manifesting in history.
• Two purposes of the incarnation: First, revelation — since no one has seen God directly, Jesus as the embodied Logos is the way God becomes knowable to human beings. Second, love — the incarnation demonstrates that God’s intention toward humanity is rescue and love, not condemnation.

The Philosophical Significance of Logos

John’s use of the Logos concept was not accidental. Logos was one of the most philosophically significant terms in the Greek intellectual tradition. Heraclitus had used it to describe the rational principle governing all change. The Stoics had made it the central concept in their metaphysics — the divine rational principle pervading all of matter, the intelligence behind the cosmos. When John opened his Gospel with ‘In the beginning was the Logos,’ he was speaking a language that any educated Hellenistic reader would immediately recognise.

His message to philosophically literate Greeks was pointed: the Logos you have been discussing — the rational principle you see as the foundation of cosmic order — is not an impersonal force. It is the agent of a personal God, through whom God created the world and with whom God has always been in relationship. And this Logos has now entered history in human form.

John’s framing also gives Christian theology a new self-understanding: it is not merely the study of what God has commanded through law (as in Jewish theology) or of mystical participation in a saviour’s death and resurrection (as in Paul’s theology). It is the study of a revealed person — the Logos made flesh — whose life, teaching, death, and resurrection constitute a comprehensive disclosure of who God is and what God wants. ‘Theology’ becomes, on John’s account, fundamentally personal and historical rather than merely abstract and doctrinal.

9. From Movement to Organisation to Institution

Understanding how Christianity developed from Jesus’s personal teaching into a formal institution requires tracking three distinct stages of development. Each stage has different characteristics, different advantages, and different risks.

The Problem of Institutions

The movement to institutionalise Christianity arose from a genuine need: with so many competing interpretations of Jesus’s message circulating, some mechanism for establishing what was and was not authentic Christian teaching was necessary. Bishop Irenaeus in the second century argued that Jesus had communicated the most important truths to his twelve apostles — his closest followers — and that the apostolic tradition was the standard against which all other interpretations should be measured. This produced the project of establishing a canonical body of scripture and a systematic creed.

But institutions carry their own risks — risks that are not specific to Christianity but are universal features of institutionalised thought. Life is dynamic; it changes moment to moment; the situations that arise in practice cannot be fully anticipated by rules drawn up in advance. Science, mathematics, and philosophy all update their frameworks as new evidence and new arguments arrive. An institution that is designed to prevent change in order to protect the original message may, over time, become the obstacle to the very understanding it was designed to preserve.

Jesus and the institution: Jesus was the most radically dynamic of teachers. He never followed a predetermined set of rules. He responded to each person and each situation from what the tradition calls his direct contact with God — his mystical intuition. His responses were always specific to the context; they could not be generalised into a rule-book without losing something essential. The institution that formed in his name was built on the conviction that it was preserving his teaching — and in many ways it was. But it preserved it in a form necessarily different from the original, filtered through centuries of interpretation and locked into a rigidity that the original teacher would not have recognised.

The Four Streams Needing Reconciliation

When Bishop Irenaeus and his successors undertook the project of establishing orthodox Christian doctrine, they faced the challenge of reconciling four substantially different bodies of thought and tradition into one coherent system:

• The Jewish prophetic tradition: The Hebrew prophets, the ten commandments, the Torah, and the figure of Yahweh — the all-powerful, personal, monotheistic God of Abraham, Moses, and David.
• Jesus’s simple ethical teaching: Love God with your whole heart; love your neighbour as yourself; repentance as radical inner transformation; humility and compassion as the central virtues; the Kingdom of God as the ultimate horizon.
• Paul’s mystery-cult interpretation: Original sin; universal fallenness; divine grace as the only salvation; Jesus as saviour god; the Adam-Jesus parallel; salvation through mystical participation in Christ’s death and resurrection.
• John’s Logos Christology: Jesus as the pre-existent Logos, through whom God created all things; the incarnation as God’s self-revelation and act of love; theology as the study of a revealed person rather than an abstract doctrine.

These four streams do not naturally fit together. They use different vocabularies, address different problems, and reflect different cultural and intellectual backgrounds. Making them into one consistent doctrine required enormous philosophical and theological work — work that was not completed in a few years but occupied the brightest minds in Christendom for centuries, and that forms the substance of medieval philosophy.

Conclusion

The formation of Christianity as a religion is one of the most complex and consequential intellectual developments in Western history. It began with the teachings of a Jewish reformer who spoke from direct experience and whose message was simple, radical, and profoundly personal. It was shaped decisively by two interpreters — Paul, who gave it a universal soteriological framework drawn from Jewish scripture and mystery cult patterns, and John, who gave it a metaphysical and philosophical foundation drawn from Greek thought. And it was ultimately institutionalised in a fixed doctrinal form by a Church that was trying to preserve a living message in a static container.

At each stage of this development, something was preserved and something was transformed. Paul’s theology is not simply Jesus’s teaching stated differently — it adds the original sin framework, the divine grace requirement, and the mystery cult interpretation of salvation. John’s theology adds the pre-existent Logos and the revelation model of the incarnation. These are genuine additions — creative theological constructions that respond to the demands of different audiences and different intellectual contexts. And the institution adds the rigidity of codified doctrine, which both protects and constrains.

The philosophical significance of all this is direct: medieval philosophy is built on exactly this foundation. When Augustine seeks to reconcile Platonic philosophy with Christian faith, he is working with the conceptual materials that Paul and John provided. When Aquinas seeks to reconcile Aristotelian philosophy with Christian doctrine, he is solving problems that the four-stream legacy of early Christianity has created. Understanding how Christianity formed is not a detour from the history of philosophy — it is the necessary preparation for understanding its next great chapter.

Frequently Asked Questions

Why is the gap between Jesus and Christianity philosophically important?

Because it means that when we study ‘Christian philosophy,’ we are not studying Jesus’s philosophy — we are studying a developing tradition of interpretation that took Jesus’s experience and teaching as its starting point but transformed them in significant ways at each subsequent stage. Paul adds the original sin framework, the divine grace requirement, and the mystery cult interpretation of salvation — none of which appears clearly in Jesus’s own teaching. John adds the Logos Christology — again, a framework drawn from Greek philosophy that Jesus never used. The institutional Church then codifies these interpretations in doctrinal form. This matters philosophically because it tells us what kind of evidence is available: when Augustine quotes Paul or John, he is quoting a Christian interpretation of Jesus, not Jesus directly. And when we study medieval philosophy, we are studying how these accumulated interpretations were engaged by philosophical reason — which is a different (and philosophically richer) project than simply studying what Jesus said.

What exactly is the difference between resurrection and resuscitation, and why does it matter?

Resuscitation describes recovery from what appears to be clinical death — the person’s biological processes recommence, they return to the same kind of existence as before, and they remain mortal and will die again. Resurrection describes something categorically different: actual, complete death followed by transformation into a permanently new mode of existence that is beyond death’s reach. The resurrected person is not merely alive again — they are permanently, irreversibly beyond the possibility of dying again. The distinction matters theologically because Christian salvation is modelled on the resurrection: the believer hopes not merely for a temporary recovery from death but for a permanent transformation into the same deathless mode of existence that Jesus is claimed to have achieved. If the event were merely resuscitation, it would offer no more theological significance than any other miraculous healing. It is the claim of permanent transformation that makes it the foundation of an entire soteriology.

What did Paul mean when he said that sin ‘possessed’ the body?

Paul describes what any thoughtful person recognises as a genuine moral experience: the gap between intention and action. I know what is right; I intend to do it; and I find myself doing something else. I do not want to smoke; I smoke. I intend to study; I open social media. Paul’s explanation for this gap is theological: the body has been taken over by sin as a power — not metaphorically but in a strong metaphysical sense. The spiritual will, attached to God, knows what is right and wills it. But the body, possessed by sin, overrides the will. This dualism — spiritual will vs sinful body — has direct implications for salvation: if the body’s possession by sin is a structural condition that overrides the will, then the will alone cannot save itself. Divine grace — God’s power intervening from outside — is the only way to break the possession. This is why Paul’s theology insists that human effort (rule-following, self-discipline, virtuous action) cannot save: the very capacity for sustained right action has been compromised at its root.

How does John’s use of Logos connect Christian theology to Greek philosophy?

The Logos was one of the most philosophically significant concepts in the Greek tradition. Heraclitus had identified it as the rational principle underlying all change and apparent contradiction in the world. The Stoics had developed it into the divine rational principle pervading all of matter — the intelligence that orders the cosmos, present in every human mind as the capacity for reason, the source of the cosmic order that philosophy studies. For educated Hellenistic readers, the Logos was a live and serious philosophical concept. When John opened his Gospel with ‘In the beginning was the Logos, and the Logos was with God, and the Logos was God,’ he was addressing this audience directly. His message: the Logos is not an impersonal cosmic principle — it is God’s own agent, present from before creation, through whom God made the world, and now incarnate in Jesus. This move transforms the Logos from a philosophical abstraction into a personal divine reality, and it transforms Jesus from a Jewish reformer into the incarnation of the very rational principle that Greek philosophy had identified as the foundation of the cosmos. It is this connection that made it possible for later thinkers like Augustine — who had read Neoplatonic philosophy before converting to Christianity — to find a philosophical home within the Christian tradition.

What is the difference between a movement, an organisation, and an institution in the context of Christianity’s development?

A movement is a loose gathering of people united by shared purpose and basic conviction — dynamic, informal, close to the founding experience. The early Jesus community in Jerusalem was a movement: a small group of people who had known Jesus or knew people who had known him, expecting the imminent arrival of God’s Kingdom, sharing their possessions, and trying to understand what had happened. An organisation is a more structured group — still capable of change and adaptation, still engaged in debate about its own principles, but coordinated enough to function across distance and membership. The early church communities Paul founded across the Roman Empire were organisations: structured, purposeful, engaged in ongoing theological debate, but not yet fixed in doctrine. An institution is a rigid system — codified beliefs, fixed practices, established hierarchy, and strong resistance to change. The Catholic Church that emerged after Constantine’s adoption of Christianity in the fourth century was an institution: its doctrines were being fixed by councils, its practices were being standardised, and its claim to authority was being institutionalised. The philosophical significance of these stages is that each stage introduced a different kind of distance from Jesus’s original teaching — the organisation through interpretation and simplification, the institution through rigidity and codification. What the institution claimed to be ‘the true teaching of Jesus’ was inevitably a teaching shaped by several centuries of this developmental process.