There are thousands of False Religions, and beliefs, and it usually falls in this categorie because they deny this.
1Jo:4:2: Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God:
1Jo:4:3: 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.
Re:1:5: And from Jesus Christ, who is the faithful witness, and the first begotten of the dead, and the prince of the kings of the earth. Unto him that loved us, and washed us from our sins in his own blood,
This is the true Christ Church, those that confess Jesus Christ.