Augustine's doctrine of original sin leaned on a mistranslated verse
The belief that every human inherits Adam's guilt took centuries to form. Its most influential architect, Augustine of Hippo, built his case on a Latin rendering of Romans 5:12 that turned death spreading because all sinned into a claim that all sinned in Adam. That shift in wording helped reshape Western theology.
Genesis 3 itself never uses the words sin, guilt or rebellion, does not link the serpent with Satan and says nothing tying sex to the first disobedience. Early Jewish writers of the Second Temple period, in books such as Sirach and the Wisdom of Solomon, often treated Adam as a heroic first patriarch and traced the origin of evil to Cain or to strange episodes in Genesis 6. Texts like 4 Ezra and 2 Baruch said death came through Adam yet insisted each person answers for their own sins.
Early Christians had no fixed doctrine before the fourth century. Some writings of the late first and early second centuries assume children are born sinless. Justin Martyr placed blame on each individual. Irenaeus pictured Adam almost as a child who ate from the tree too soon. Origen, reading Genesis largely as allegory, rejected an inherited sinful state, and Methodius of Olympus, arguing against him, was the first to call Adam's story the Fall.
The idea of inheritance grew step by step. Tertullian argued that souls descend from parents, so all carry something of Adam's. Cyprian was first to tie inborn guilt to infant baptism. Then Ambrosiaster produced the rendering of Romans 5:12 as in him all sinned, and Augustine, citing him, used it against the Pelagians, who held that people merely imitate Adam. Augustine was the first to use the phrase original sin, and councils at Carthage and Orange wrote the concept into official Church teaching.
Later traditions split sharply. Greek Fathers stressed that humans are born into a fallen world yet remain free. Luther and Calvin equated original sin with harmful desire that survives baptism and destroys free will except to sin, a view the Jansenists shared and Rome condemned. The Catholic position holds that baptism erases original sin while a weakened nature remains, and the Council of Trent insisted free will was bent but never extinguished.
Source: Original sin
