Apostasy in Christianity

Apostasy in Christianity is the rejection of Christianity by someone who formerly was a Christian. The term apostasy comes from the Greek word apostasia ("") meaning defection, departure, revolt or rebellion. It has been described as "a willful falling away from, or rebellion against, Christianity. Apostasy is the rejection of Christ by one who has been a Christian...." "Apostasy is a theological category describing those who have voluntarily and consciously abandoned their faith in the God of the covenant, who manifests himself most completely in Jesus Christ." "Apostasy is the antonym of conversion; it is deconversion."

According to B. J. Oropeza, the warning passages in the New Testament describe at least three dangers which could lead a Christian to commit apostasy:

Persecution is highlighted in the Epistle to the Hebrews and the First Epistle of Peter. The issue of false teachers/teachings is found in the Johannine and Pauline epistles, in the Second Epistle of Peter and the Epistle of Jude. A number of sections in the writings of Paul and James focus on vices and virtues. "These and other early texts helped to shape the trajectory of Christian response to the phenomenon of defection in the post-apostolic era. The Christians were to persevere through various types of opposition, standing firm against temptation, false doctrine, hardships and persecution."

The Greek noun apostasia (rebellion, abandonment, state of apostasy, defection) is found only twice in the New Testament (Acts 21:21; 2 Thessalonians 2:3). However, "the concept of apostasy is found throughout Scripture." The related verb aphistēmi (go away, withdraw, depart, fall away) carries considerable theological significance in three passages (Luke 8:13; 1 Timothy 4:1; Hebrews 3:12).

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