1 But the Spirit explicitly says that in later times some will fall away from the faith, paying attention to deceitful spirits and doctrines of demons, 2 by means of the hypocrisy of liars seared in their own conscience as with a branding iron, 3 men who forbid marriage and advocate abstaining from foods which God has created to be gratefully shared in by those who believe and know the truth. 1 Timothy 4:1-3 (NASB)
According to the words of our Lord Jesus Christ in John 15 the mark of Christian authenticity is abiding or remaining in Him. This is not simply a continual profession of faith, but a remaining faithful to Christ in our orthodox Christian faith. According to Paul, It is a two-fold action of departing from the faith and giving heed to seducing spirits, and doctrines of devils. The Apostle John called the Christian leaders who do this antichrists.