1 John 4:3

3 And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is it in the world.

Ver. 3. Is not of God ] And yet he is not called an Atheist, or an Antitheist, but Antichrist, that is, an opposite to Christ; as if his opposing should not be so much to Christ’s nature or person, as to his unction and function.