Apostasy in Christianity is the rejection of Christianity by someone who formerly was a Christian or who wishes to administratively be removed from a formal registry of church members. The term apostasy comes from the Greek word apostasia ("ἀποστασία") 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."