I would never suggest such a thing. It is written,
Philippians 2
6who, being in the form of God, did not consider it robbery to be equal with God, 7but made Himself of no reputation, taking the form of a bondservant, and coming in the likeness of men. 8And being found in appearance as a man, He humbled Himself and became obedient to the point of death, even the death of the cross.
Can you attempt to answer the question? Or is it that you do not understand it? I fear so.
You see, God made Adam. Adam fell. We are all desecnded from Adam.
Orthodox Christianity believes that God took this humanity, from Mary, and united it to Himself in the person of Jesus.
Jesus, through His perfect obedience to God enabled us to be redeemed. He was the perfect human.
Now, if you do nto believe that God took humanity from Mary in order to unite man to Himself, then where did He get the humanity?
If He created a new humanity, unrelated to the old, then how could Jesus have redeemed the old humanity?
If He was not related to us, not a human of Adam's line, then how is He our Savior?
SD
Now that I think about it, this would also have the effect of removing any possibility of Jesus literally being from the line of David. If Joseph is not his bio-dad, and Mary is not his bio-mom, then how can he be said to have any claim to the throne of David?
There shall come forth a shoot from the stump of Jesse, and a branch shall grow out of his roots. (Isaiah 11:1)
Instead of a branch growing out of the roots, we have a whole brand new branch, attached, apparently, to nothing at all.
This begins to sound like a variety of Docetism.
Valentinus the Egyptian attempted to accommodate his system still more closely to Christian doctrine by admitting not merely the reality of the Saviour's body but even a seeming birth, saying that the Saviour's body passed through Mary as through a channel (hos dia solenos) though he took nothing from her, but had a body from above. (Catholic Encyclopedia, Docetism)