The way, the truth, and the life – Jesus Christ, page-1821

"The Incarnation, or Jesus becoming man, is a unique event in which God revealed himself to humanity through the person of Jesus Christ."

God reveal himself by dwelling in the Temple Jesus, and God did NOT become this Temple John 14:10.
Jesus defines the Father dwelling in him as the Only True God.
God revealed his Person in the words he gave Jesus, the reason Jesus is called the express image of him, expressing out WORD, The Word, the Father in words.
God is Spirit as are his words, and likewise for us.

It would be unique if another being become man, but the scriptures plainly teach, that this did NOT happen.
The 2nd Adam was made from nothing more than a plan hid in God Eph 3:9, that is all that become flesh and No existing being become flesh..


The rest of your story is exactly that, story telling to bend and twist scripture to fit your creations and to try and insert the impossible, trinity.
Hear O Israel: Yehowah our God is ONE Yehowah. and Jesus stood by this and quoted it and confirmed it beyond doubt with John 17:3.
And 1 Cor 8:6 - But to us there is but one God, the Father, of whom are all things, and we in him; and one Lord Jesus Christ, through whom are all things, and we through him.

When did this change = NEVER, but many changed it, led by the CC's, not long after Jesus and the Apostles.

What has rightfully changed now, after Jesus was exalted and Glorified and ruling for The God and Father, he has become a Begotten God, which simply means as Jesus confirms in John 17:3, he was not while here a Begotten God.