The idea in one paragraph
Christians believe humanity was made good, in the image of God, yet no honest observer thinks we consistently live that way. The doctrine of original sin names the gap. It says that since the first human rebellion, described in Genesis 3 through the story of Adam and Eve, every person inherits a nature inclined away from God. We are not sinners because we sin; we sin because something in us is already bent. G. K. Chesterton famously called it the one Christian doctrine you can verify by reading the morning paper.
Where the teaching comes from
The raw material is biblical. Genesis tells of a good creation spoiled by human disobedience. The Psalms speak of being “sinful from birth” (Psalm 51). Paul draws the threads together in Romans 5: through one man sin entered the world, and death through sin, so that death spread to all. The formal doctrine was worked out most fully by Augustine of Hippo in the fourth and fifth centuries, in debate with a British-born monk named Pelagius, who argued that people could obey God unaided if they simply tried hard enough. The church sided with Augustine: we need rescue, not merely encouragement.
What original sin is not
- It is not personal guilt for Adam's choice. Most traditions distinguish the inherited condition from the sins each person actually commits.
- It is not total worthlessness. The image of God in every person is damaged, not erased. Human beings remain precious, creative and capable of real kindness.
- It is not an excuse. The doctrine explains the pull towards wrongdoing; it never removes responsibility for yielding to it.
How the traditions understand it
Every historic church confesses some form of the doctrine, with real differences of emphasis:
- Roman Catholic. Original sin is the loss of original holiness, transmitted to all humanity, washed away in baptism though a weakness called concupiscence remains. This is one reason infants are baptised.
- Anglican. Article IX of the Thirty-nine Articles describes original sin as “the fault and corruption of the nature of every man”, an infection of nature rather than mere imitation of bad examples. You will still hear its echo in Church of England baptism and confession liturgies.
- Orthodox. Eastern Christians usually speak of “ancestral sin”: we inherit mortality and a world disordered by sin, rather than a share in Adam's guilt.
- Reformed. Following Calvin and the Westminster Confession, Reformed churches, including the Church of Scotland historically, teach that the fall left human nature unable to turn to God without grace.
- Methodist and Wesleyan. John Wesley affirmed the doctrine firmly, but paired it with prevenient grace: God's kindness already at work in every life, enabling a free response.
Why it matters
Far from being gloomy, the doctrine is oddly liberating. It tells the truth about the world: cruelty and self-interest are not surprises to be explained away but symptoms of a shared condition. It levels all of us; there is no room for looking down on anyone, because the fault line runs through every heart. And it prepares the ground for the good news, because a diagnosis this honest calls for a remedy stronger than self-improvement. That remedy, Christians say, is the grace of God in Jesus Christ, who deals with both the guilt and the disease.
Common questions
- Do I have to read Genesis literally to accept this? No. Christians hold a range of views on the early chapters of Genesis. The doctrine stands on the observable reality of universal human sinfulness and the witness of the whole of Scripture.
- What about babies? Traditions differ in detail, but none teaches that God is unjust towards infants. Churches that christen babies see baptism as God's welcome given before the child can earn anything, which is rather the point.
- Is this unique to Christianity? Many philosophies notice human moral failure. What Christianity adds is a story of why, and a rescue.
Exploring further
If this doctrine raises questions for you, a conversation with a vicar, priest or minister is a good next step; most are glad to talk it through over a cup of tea. You might also read Romans 5 to 8 slowly, or pick up Mere Christianity by C. S. Lewis, which treats the human predicament with wit and honesty. And the doctrine is best understood from inside a worshipping community, where confession and forgiveness are practised weekly.