From the Second Helvetic Confession-
CHRIST IS TRUE GOD. We further believe and teach that the Son of God, our Lord Jesus Christ, was predestinated or foreordained from eternity by the Father to be the Savior of the world. And we believe that he was born, not only when he assumed flesh of the Virgin Mary, and not only before the foundation of the world was laid, but by the Father before all eternity in an inexpressible manner. For Isaiah said: “Who can tell his generation?” (Ch. 53:8). And Micah says: “His origin is from of old, from ancient days” (Micah 5:2). And John said in the Gospel: “In the beginning was the Word, and the Word was with God, and the Word was God,” etc. (Ch. 1:1). Therefore, with respect to his divinity the Son is coequal and consubstantial with the Father; true God (Phil. 2:11), not only in name or by adoption or by any merit, but in substance and nature, as the apostle John has often said: “This is the true God and eternal life” (I John 5:20). Paul also says: “He appointed the Son the heir of all things, through whom also he created the world. He reflects the glory of God and bears the very stamp of his nature, upholding all things by his word of power” (Heb. 1:2 f.). For in the Gospel the Lord himself said: “Father, glorify Thou me in Thy own presence with the glory which I had with Thee before the world was made” (John 17:5). And in another place in the Gospel it is written: “The Jews sought all the more to kill him because he…called God his Father, making himself equal with God” (John 5:18).
THE SECTS. We therefore abhor the impious doctrine of Arius and the Arians against the Son of God, and especially the blasphemies of the Spaniard, Michael Servetus, and all his followers, which Satan through them has, as it were, dragged up out of hell and has most audaciously and impiously spread abroad in the world.
If you imagine a purely human Christ you imagine a pointless man whose life and death mean nothing.