Bs"d
Is it really so hard to understand that that is a falsification?
"Serve Y-H-W-H! And if it seems evil to you to serve Y-H-W-H, choose for yourselves this day whom you will serve, whether the gods which your fathers served that were on the other side of the River, or the gods of the Amorites, in whose land you dwell.
But as for me and my house, we will serve Y-H-W-H!.”
Joshua 24:14-15
So if you accept one book that John wrote as truth, on what basis do you count the other as a falsification?
John isn't the only one to speak of a trinity. Mathew records an episode where all three persons of the trinity are present...
Matthew 3:16 When He had been baptized, Jesus came up immediately from the water; and behold, the heavens were opened to Him, and He saw the Spirit of God descending like a dove and alighting upon Him. 17 And suddenly a voice came from heaven, saying, “This is My beloved Son, in whom I am well pleased.”
Jesus, whom you've already conceded is God (John 1), the Spirit of God in the form of a dove and God the Father speaking from heaven concerning His Son.
Sounds like three to me! But then there are three kinds of people in the world; those who can count and those who can't!
Resting in Him,
Clete