I just don't know how anyone can deny Jesus is the Son of God. But to this day, even his own people do. The fact that he is without sin should have been enough for anyone.
And there is PLENTY of scriptural support in regards to this. Seems like a there are ones who prefer the King James Version.., here's a quote from that translation:
14 And we have seen and testify that the Father has sent the Son as Savior of the world. 15 Whoever confesses that Jesus is the Son of God, God abides in him, and he in God.