That seems to be the core of the problem.
The Trinity is not taught in the Bible, but many people have been deluded into believing it is taught in the Bible.
And yet, in 1700 years of the Church teaching the Trinity doctrine, not a single Trinitarian has been able to prove that the Bible teaches the Trinity.
Genesis 1:1 English Standard Version (ESV)
1 In the beginning, God created the heavens and the earth.
John 1:1 English Standard Version (ESV)
1 In the beginning was the Word, and the Word was with God, and the Word was God.
John 1:14
English Standard Version (ESV)
14 And the Word became flesh and dwelt among us, and we have seen his glory, glory as of the only Son from the Father, full of grace and truth.
1 John 1:1-2 English Standard Version (ESV)
The Word of Life
1 That which was from the beginning, which we have heard, which we have seen with our eyes, which we looked upon and have touched with our hands, concerning the word of life—
2 the life was made manifest, and we have seen it, and testify to it and proclaim to you the eternal life, which was with the Father and was made manifest to us—