Well, we're all on the same page, namely John 1, yes?
"In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God. All things came into being through Him, and apart from Him nothing came into being that has come into being. In Him was life, and the life was the Light of men...
There was the true Light which enlightens every person coming into the world. He was in the world, and the world was made through Him... And the Word generated [ginomai] flesh, and dwelt among us, and we saw His glory, glory as of the only-one-generated [mono-ginomai] from the Father, full of grace and truth"
And 1 John 5:7-8,
For there are three that testify in heaven: the Father, the Word and the Holy Spirit, and these three are one. And there are three that testify on earth: the Spirit, the water and the blood; and the three are in one.
So, from time human-immemorial, in heaven there has long long existed "God the Father", "the Word of God", and the "Holy Spirit of God". All three are of "one" and the same Divine Essence, and certainly "God the Father" and "the Word of God" have (per John 1) existed "from the Beginning" ("from the Big Bang" so to speak), and have existed continuously ever since, and will exist continuously into the future and so be "co-eternal".
"The Word of God" is some sort of "matter animating life spark of light" that can organize and structure matter throughout the Universe. Per John 1, every organized structure that exists does so because it was "generated" and "caused to be" [
ginomai] by the "matter animating life giving spark" of the Word.
The Word manifested within Mary, and so -- unique in human history -- "generated" and "wrought" and "caused to be" [
mono-ginomai] human flesh into the wondrously miraculously born baby Jesus, "infused" and "inspired" with the "incarnated Divine Presence of God in heaven" from pre-conception to birth and throughout Jesus' life on Earth... all, moreover, according to ancient Prophesies proclaiming a Divine Plan pre-dating Abraham (John 8). Such was the "inspiring incarnated Divine Presence of God" within the "Word-wrought flesh" of Jesus on Earth, that all beholding him witnessed the "glory... grace & truth" of "God the Father in heaven" (John 1).
Of course, "no one has seen God [the Father] at any time", but by that wondrously miraculous & mighty "inspiring incarnated Divine Presence of God's Word" within the "God-crafted flesh" of Jesus on Earth, the same was Divinely Guided to be the long-Prophesied Christ Messiah, who "explained Him [= God the Father]" (John 1:18).
I interpret all this to mean, that Jesus' bodily form on Earth was that of a human male, with flesh & bones & muscle tissues & neurons & body organs, having 46 DNA chromosomes including one X and one Y... none of which was,
per se, "God the Father in heaven" Whom "no one has seen"...
But the miraculous mystery was the wondrous "inspiring incarnating Divine Presence of the eternal Word of God inhabiting" that physical fleshly form, from pre-conception throughout Jesus' Earthly life, all according to even-then-ancient Prophesy, communicated repeatedly to people upon this planet,
via "inspiration" from the Holy Spirit.
So there was a "Jesus the man" on Earth with a mortal "human nature" whose limitations he often prayed to overcome (Matt 4, Wilderness Temptations; Luke 22:42, "not my will but Thine Will be done") ... yet he always miraculously existed in "extremely close communion" with the wondrous "inspiring incarnating Divine Presence of the eternal Word of God inhabiting" that physical fleshly form, so "infusing" the same with "Divine Nature" in a completely harmonious united union in the one person of "Jesus Christ" = [God-generated, God-wrought] man + God's Word in man.
I don't perceive this to be "adoptionist" or "Arian" or otherwise incompatible with the Chalcedonian Credo, whose language is of course extremely sophisticated & complex and not necessarily obvious the first time around.