This is how you can recognize the Spirit of God: Every spirit that acknowledges that Jesus Christ has come in the flesh is from God. But every spirit that does not acknowledge Jesus is not from God. This is the spirit of the antichrist, which you have heard is coming and even now is already in the world. 1 John 4:2-3
Who is the liar? It is the man who denies that Jesus is the Christ. Such a man is the antichrist–he denies the Father and the Son. No one who denies the Son has the Father; whoever acknowledges the Son has the Father also. 1 John 2:22,23
Many deceivers, who do not acknowledge Jesus Christ as coming in the flesh, have gone out into the world. Any such person is the deceiver and the antichrist. 2 John 1:7
Will Islam Be Our Future?
A Study of Biblical and Islamic Eschatology