The RCCG affirms the traditional Christian doctrine of original sin. As a result of Adam's transgression, all humanity is fallen and separated from God. Sin is not merely an action but a condition: human beings are born into a sinful state and are prone to transgress God's law. The consequence of sin is spiritual death and separation from God.

The doctrine of original sin creates the necessity for redemption. No person can save themselves; all are in need of God's grace and the new birth. The RCCG emphasizes the seriousness of sin and the radical transformation required in conversion. The individual must be born again—a complete spiritual renewal by the power of the Holy Spirit—to enter God's Kingdom. The doctrine of original sin also supports the RCCG's understanding of the universality of Christ's redemptive offer: all need salvation because all are sinners.