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Christianity is the faith centred on Jesus Christ: who he is, what he has done, and what it means to trust and follow him. At its heart, Christianity says that the God who made the world has come to rescue and renew it through the life, death and resurrection of Jesus.
That is a high-level answer, but it is important to say it carefully. Christianity is not merely a moral code, a political tradition, a Western cultural inheritance, or a vague belief in “being spiritual.” It is a historical and personal claim about God, humanity and Jesus.
In the spirit of C.S. Lewis’s “mere Christianity,” this article focuses on the core beliefs shared by historic Christians across denominations, without going into secondary debates that matter but are not the best starting place.
Christianity begins with God
Christianity begins with the claim that God exists and that he is not an impersonal force. God is personal, eternal, holy, loving and the creator of all things.
Christians believe God is Trinity: Father, Son and Holy Spirit. That does not mean Christians believe in three gods. It means the one God eternally exists as three persons. This is a deep doctrine, but it matters because Christianity says love and relationship are not afterthoughts in reality. They are rooted in who God is.
If you are new to this idea, it is fine not to understand it all at once. The first step is not mastering technical language, but seeing why Christians believe Jesus reveals God uniquely.
Christianity says the world is created and meaningful
Christians believe the world is created by God and therefore has meaning. The physical world is not a mistake. Human life is not random or disposable. Beauty, morality, love, reason and longing are not illusions. They are clues that reality is deeper than matter alone.
This is why the Bible begins with creation. Before Christianity tells us what is wrong, it tells us what is good: God made the world, and human beings are made in his image.
For the big picture, watch Episode 1: Beginnings and Episode 2: Identity.
Christianity takes evil seriously
Christianity is not naive about the world. It says the world is good, but also profoundly broken. The Bible calls this problem sin.
Sin is more than bad behaviour. It is a turning away from God. It affects our desires, relationships, societies and worship. It explains why human beings can be capable of love, courage and creativity, while also being capable of cruelty, pride and self-deception.
This diagnosis can sound uncomfortable, but it is not meant to crush human dignity. It tells the truth about our condition so that grace can be seen for what it is: rescue, not self-improvement.
Explore this in Episode 3: Catastrophe and What is sin?
Christianity is centred on Jesus
The centre of Christianity is not a philosophy, institution or ethical programme. The centre is Jesus.
Christians believe Jesus of Nazareth is the Messiah promised in the Old Testament, fully God and fully human. He is not merely a religious teacher who gave helpful advice. He claimed unique authority, forgave sins, announced God’s kingdom, accepted worship and spoke as the one who reveals the Father.
This is why the question “Who is Jesus?” matters so much. If Jesus is only a teacher, Christianity becomes one moral tradition among many. If Jesus is Lord, then Christianity is a response to reality.
Start with Episode 6: Messiah, then read Who is Jesus?, Is Jesus God? and Is there evidence for Jesus’ existence outside the Bible?
Christianity says Jesus died for sinners
The cross is one of the most recognisable symbols in the world, but Christians do not see it merely as a symbol of suffering. They see it as the place where Jesus accomplishes salvation.
Christians have used several biblical images to describe the cross: sacrifice, substitution, victory, ransom, reconciliation and forgiveness. These images are not enemies. Together they show that Jesus’ death deals with sin, defeats evil, reveals God’s love and opens the way back to God.
At a high level, Christianity says we do not climb up to God by moral achievement. God comes down to us in grace.
Explore this in Episode 7: Salvation, What did Jesus accomplish through his death? and What does it mean that Jesus died once for all?
Christianity stands on the resurrection
The resurrection is not an optional extra. The earliest Christians claimed that Jesus really rose from the dead. They did not mean merely that his influence continued, or that they had a private spiritual feeling. They proclaimed that God raised Jesus bodily from death.
This matters because the resurrection is God’s vindication of Jesus. It means the cross was not defeat. It means death is not ultimate. It means Christian hope is grounded not in wishful thinking, but in an event Christians believe happened in history.
To examine this claim, watch Episode 8: Resurrection and read Did the resurrection really happen?
Christianity calls for faith, repentance and new life
Christianity is not just agreeing that certain doctrines are true. It calls for a personal response: repentance and faith.
Repentance means turning from sin and self-rule toward God. Faith means trusting Jesus — not merely believing that he exists, but relying on him as Saviour and Lord. This response is not a way to earn salvation. It is the way we receive grace.
That is why Christianity is both deeply humbling and deeply hopeful. It tells us we are more sinful than we like to admit, but more loved than we dared to imagine.
If you are thinking about this personally, watch Episode 9: Jump and read I believe in God. Doesn’t that make me a Christian?
What do all historic Christians agree on?
Christians differ on some important matters, including church structure, baptism, communion, worship style and some theological details. Those differences are not meaningless. But they should not obscure the central claims of the faith.
Historic Christianity holds that:
- There is one God, the creator of all things.
- God is Father, Son and Holy Spirit.
- Human beings are made in God’s image but fallen in sin.
- Jesus Christ is fully God and fully human.
- Jesus died for our sins and rose bodily from the dead.
- Salvation is God’s gift of grace, received through faith.
- The Bible is the authoritative witness to God’s redemptive story.
- Jesus will return, judge evil and renew creation.
That is the “mere Christianity” centre. It is not everything Christians believe, but it is the right starting point.
Is Christianity intellectually honest?
Christianity asks for faith, but not blind faith. The Christian claim is rooted in public history: Jesus lived, was crucified, and his followers soon proclaimed that he had risen. Christianity also offers a serious account of human dignity, evil, morality, longing, guilt, forgiveness, beauty and hope.
None of this means every question is simple. Christians should be honest about mystery, tension and the need for careful thought. But faith is not the opposite of reason. Christian faith is trust in God based on who he is and what he has done.
What Christianity is not
Christianity is not mainly being a good person
Good works matter, but they are not the foundation of salvation. Christianity says we are saved by grace and then called into a transformed life.
Christianity is not merely going to church
Church matters because Christians are called into a community. But attending church does not automatically make someone a Christian. The central issue is personal trust in Jesus.
Christianity is not anti-intellectual
Christianity has a long tradition of serious thought, scholarship, philosophy, science, art and public reasoning. It welcomes honest questions.
Christianity is not less than personal, but it is more than private
Faith in Jesus is personal, but it is not merely private. If Jesus is Lord, that shapes worship, ethics, relationships, work, justice, suffering and hope.
A simple summary of Christianity
Christianity is the good news that the God who made us has come to rescue us through Jesus Christ. Jesus lived the life we have not lived, died for our sins, rose from the dead, and now calls people everywhere to receive forgiveness, follow him and hope in the renewal of all things.
Keep exploring
The best way to understand Christianity is to understand the story it tells. Start with Long Story Short’s free Bible Explained series, then watch Episode 6: Messiah, Episode 7: Salvation and Episode 8: Resurrection.