1 John 2:22-23 “Who is a liar but he that denieth that Jesus is the Christ? He is antichrist, that denieth the Father and the Son. Whosoever denieth the Son, the same hath not the Father: (but) he that acknowledgeth the Son hath the Father also.”
Titus 2:13 “Looking for that blessed hope, and the glorious appearing of the great God and our Savior Jesus Christ”.
Isaiah 43:11 “I, I am Yahweh; and beside me there is no savior.”
John 10:30 “I and my Father are one.”
So you see those who reject Christ are rejecting Yahweh God the Father also.