if everyone came from Adam, Mother Mary was a great great granddaughter?

God is Adams creator. God is Jesus father

I don't get the question. An if/then construct implies some connection between the two concepts. The Son of God coming from Mary has no bearing with the relation between Adam and God.

The pivotal point of your question is "IF everyone came from Adam." Since most of us regard the creation story as metaphor, there is no literal Adam, hence no relationship.

Adam would still have been a creature of God, no surprise there. [That is, IF Adam were an historic person, which I'm sure you would agree was not the case]

Of course you speak strictly in terms of flesh bodies. Adam was the father - and Eve the mother - of all flesh.

Gen 3:20 And Adam called his wife's name Eve; because she was the mother of all living.

Now then, Jesus is called in scripture both the Son of God (his Spirit nature) and the Son of man (his flesh nature)

Man in that passage refers to Hebrew adam (aw-dum) meaning the man Adam himself - and by extension all mankind as we all proceed from Adam

Scripture calls Adam himself "the son of God"

But Adam was not begotten (born). So Jesus is "the only begotten Son of God". Jesus was born (begotten) by a virgin Mary.

Luk 3:38 Enos was the son of Seth, which was the son of Adam, which was the son of God.

God created Adam .. and one of Adam's descendants was Mary,

who was the mother of Jesus Christ.

(NOTE: I did not use a grand title like you did in referring to her)

The humanity of Jesus came from Mary .. ie: "Son of Man"

The deity of Jesus was God incarnate .. ie: "Son of God"

Another descendant of Adam was King David .. and through the

bloodline of Mary, a descendant of King David, Jesus became the

King of kings and Lord of lords reigning eternally on the throne.