'''Apostasy''' , Greek: ἀποστασία - (rebellion, abandonment, state of apostasy, defection) , in Orthodox Christianity is the rejection of [[Christ]] and His saving power after [[baptism]], a falling away. An '''apostate''' is a person who has entered into apostasy, leaving that is, has abandoned the Church.  The Greek noun ''apostasia'' is found twice in the [[New Testament]], (Acts 21:21; 2 Thessalonians 2:3).