"Do you believe that Christ existed in some form before He became flesh ?"
His form before flesh, was a plan to be in the mind of God, known as the firstborn of creation, in God where all our creations begin.
In the very same context, the Jesus to be was the beginning of the creation of God and slain in the future in this plan Col 1:15, Rev 3:14, 13:8.
Because of this future one - "because in Him" Yehowah alone and by himself created all things Isa 44:24, on account of, by reason of, because of, for the sake of the Jesus to be, where he became the firstborn from the dead, 'so that' he would then physically hold preeminence in all things Col 1:16, 18.
What actually come down from heaven = the word of the God and Father, via the Angel to Mary.
Like, let there be light, let there be a Jesus.
Isa 55:10, 11 - For as the rain cometh down, and the snow from heaven, and returneth not thither, but watereth the earth, and maketh it bring forth and bud, that it may give seed to the sower, and bread to the eater:
So shall my word be that goeth forth out of my mouth: it shall not return unto me void, but it shall accomplish that which I please, and it shall prosperin the thing whereto I sent it.
John 16:27, 28 - for the Father Himself loves you, because you have loved Me, and have believed that I came forth from God.
I came forth from the Father, and am come into the world: Furthermore, I leave the world, and go to the Father.
John 8:42 - Jesus said unto them, If God were your Father, ye would love me: for I proceeded forth and came from God; neither came I of myself, but he sent me.
He came forth out of the mouth of the God and Father, Yehowah.
He was sent, come into the world AFTER his Baptism -> ex - John 17:18 - As thou hast sent me into the world, even so have I also sent them into the world.
As Jesus was raised in, taught the word of God by the Father Deu 18:18, he likewise taught them in the Fathers word, and like he was sent, he sent them.
That is the context of all sents, sending etc, after his Baptism.
--------------
Ask yourself a simple question zbusc, WHY out of all the numerous prophesies of the future Jesus in the OT, does not a single one even hint at, that this one to come already existed in some way shape or form, that would come down and take on flesh or enter the womb of Mary??????????????????????????????????????????????????????????????????
To boot, if the Jews were worshiping what they deemed as a singular God, like one apple, when in fact as you say, God is 3 persons, then the Jews would be worshiping a false God.
Surely God would have at least let the likes of Abraham, Moses and Co know this ??????????????????????????????
The OT is full of God wanting to be known, his ways and words followed etc.
Expand