Antichrist: Denies the Incarnation of Christ
Source: TTT
1 John 4:3
and every spirit that does not confess Jesus is not from God. This is the spirit of the antichrist, which you have heard is coming and which is already in the world at this time.
2 John 1:7
For many deceivers have gone out into the world, refusing to confess the coming of Jesus Christ in the flesh. Any such person is the deceiver and the antichrist.