Original Sin

Original sin, also called ancestral sin, is, according to a Christian theological doctrine, humanity's state of sin resulting from the fall of man. This condition has been characterized in many ways, ranging from something as insignificant as a slight deficiency, or a tendency toward sin yet without collective guilt, referred to as a "sin nature", to something as drastic as total depravity or automatic guilt of all humans through collective guilt.

The concept of original sin was first alluded to in the 2nd century by Irenaeus, Bishop of Lyons in his controversy (written in Greek) with the dualist Gnostics. Its scriptural foundation is based on the New Testament teaching of Paul the Apostle (Romans 5:12-21 and 1 Corinthians 15:22). Tertullian, Cyprian, Ambrose and Ambrosiaster considered that mankind shares in Adam's sin, transmitted by human generation. Augustine's formulation of original sin was popular among Reformers, such as Martin Luther and John Calvin who equated original sin with concupiscence, affirming that it persisted even after baptism and completely destroyed freedom. Within Roman Catholicism, the Jansenist movement, which the Church then declared heretical, also maintained that original sin destroyed freedom of will.

The doctrine is not found in Judaism or in Islam.