Sin, Salvation & Atonement
What Is Sin?
Sin is any thought or action that goes against God’s will. Christians believe sin damages the relationship between humans and God. Every time a person sins, they move further away from God. Sin can take many forms — lying, stealing, hatred, selfishness, envy and many others.
Christians believe all humans are sinful. Nobody is perfect, and everyone falls short of God’s standards. St Paul wrote: “For all have sinned and fall short of the glory of God” (Romans 3:23). This is a problem because God is holy and just — sin cannot exist in God’s presence. Humans therefore need to be saved from the consequences of their sin.
Original Sin
Original sin is the belief that all humans are born with a built-in tendency to do wrong. This idea comes from the story of Adam and Eve in Genesis 3. God placed Adam and Eve in the Garden of Eden and told them not to eat from the Tree of Knowledge of Good and Evil. The serpent tempted Eve, she ate the fruit, and Adam followed.
Adam and Eve’s disobedience is called the Fall. Christians believe this act of disobedience broke the perfect relationship between God and humanity. As a result, all humans are born with a tendency to sin — this is original sin. It is not a specific sin a person commits, but a condition inherited from the first humans.
Catholic view: Original sin is washed away through the sacrament of baptism. This is one reason Catholics baptise infants — to free the baby from original sin as early as possible. Even after baptism, humans still have a tendency to sin (called concupiscence).
Protestant view: Most Protestants accept the concept of original sin but emphasise that salvation comes through faith in Jesus rather than through sacraments. Some Protestants do not practise infant baptism, believing a person must choose to follow Christ for themselves.
Liberal view: Some liberal Christians see the story of Adam and Eve as a myth that teaches an important truth — humans have a natural tendency to do wrong — rather than a literal historical event. The lesson is the same: humans need God’s help to overcome sin.
What Is Salvation?
Salvation means being saved from sin and its consequences — ultimately, being granted eternal life with God rather than eternal separation from God. Christians believe humans cannot save themselves because all are sinful. They need God’s help.
The specification names three means of salvation: law, grace and Spirit. Different Christian traditions emphasise these differently.
Salvation Through Law
Some Christians believe that following God’s laws — the Ten Commandments and the moral teachings of Jesus — is essential for salvation. By obeying God’s commands, a person shows they are devoted to God and deserving of eternal life. Catholics especially emphasise the importance of good works alongside faith — the Epistle of James states: “Faith by itself, if it is not accompanied by action, is dead” (James 2:17).
Salvation Through Grace
Grace is the free, undeserved gift of God’s love. Christians believe God offers salvation not because humans deserve it, but because God loves them. Ephesians 2:8–9 states: “For it is by grace you have been saved, through faith — and this is not from yourselves, it is the gift of God — not by works, so that no one can boast.”
Protestants, especially those in the Reformed tradition, emphasise salvation by grace alone through faith alone. Humans cannot earn salvation by doing good deeds — it is a free gift from God, received through faith in Jesus Christ. Catholics believe both faith and works are necessary — grace enables good works, and both contribute to salvation.
Salvation Through the Holy Spirit
Christians believe the Holy Spirit plays an active role in salvation. The Spirit works within believers to help them recognise their sin, turn towards God, and live a holy life. Charismatic and Pentecostal Christians particularly emphasise the role of the Holy Spirit, believing it gives spiritual gifts such as speaking in tongues, prophecy and healing.
The Holy Spirit guides Christians in daily life, helping them make good decisions and resist temptation. Jesus promised: “The Advocate, the Holy Spirit, whom the Father will send in my name, will teach you all things” (John 14:26). The Spirit also brings comfort in suffering, strengthens faith in difficult times, and empowers Christians to share the gospel with others.
The Role of Christ in Salvation
All Christians agree that Jesus Christ is central to salvation. Without Jesus, humans would remain trapped in sin with no way back to God. Jesus’s death and resurrection made salvation possible.
Atonement
Atonement literally means “at-one-ment” — making God and humanity “at one” again. It is the belief that Jesus’s death on the cross restored the broken relationship between God and humans caused by sin. Through his sacrifice, Jesus took the punishment that humans deserved.
Isaiah 53:5 prophesied the atonement: “He was pierced for our transgressions, he was crushed for our iniquities; the punishment that brought us peace was on him, and by his wounds we are healed.” Christians believe this prophecy was fulfilled by Jesus on the cross.
Substitutionary atonement: Jesus took the place of sinful humans and bore the punishment they deserved. He was a substitute — dying instead of humanity. This view is common among evangelical Protestants.
Satisfaction theory: Human sin offended God’s honour and justice. Only a perfect sacrifice could satisfy God’s justice. Jesus, being sinless, was the only one who could offer this perfect payment. This view is associated with Anselm of Canterbury and is the foundational Catholic/Thomistic atonement model. Note: the penal substitution view described above is a distinctly Protestant teaching, rooted in Luther and Calvin; Anselm's satisfaction theory differs in mechanism (paying an honour-debt, not a penal penalty).
Moral example: Some liberal Christians see Jesus’s death less as a payment for sin and more as a supreme example of self-sacrificing love. His willingness to die inspires Christians to live selflessly and sacrificially for others.
Regardless of which understanding they hold, all Christians agree that the atonement makes salvation available. Jesus’s sacrifice opened the door for humans to be reconciled with God, forgiven for their sins, and given the promise of eternal life.