Pelagianism

A concept proposed by Pelagious (circa 356 to circa 418 AD) who denied the existence of original sin inherited from Adam. He taught that a soul created by god cannot inherit sin from an ancestor. Thus, humans are born morally neutral. They can fall into habits of sin but can overcome sin through mental effort.

Pelagious promoted adult baptism in place of infant baptism. His beliefs were declared heretical by the Christian movement.