Kosta:
To say that she gave birth to man Jesus is just plain not true. Buggman
"Concerning his Son Jesus Christ our Lord, which was made of the seed of David according to the flesh . . ." (Rom. 1:3)kai to gennwmenon agion klhqhsetai, uioV qeou [Luk 1:35]
(and the holy that shall be begotten (of Mary) shall be called the Son of God). Son of God is God. Incarnate Son of God is God. The Child born of Virgin Mary was and is God.
That's not exactly helping your case (and I'm not sure what significance we were supposed to get from the Greek in your argument). "Son of God" was, to the 1st Century Jews, simply a title for the Messiah derived from 2 Sa. 7:14 and Psalm 2. For example, when Kefa (Peter) made his confession of faith in Mat. 16 and called Yeshua "the Messiah, the Son of God," he was not suddenly endowed with full knowledge of the Trinity--he was using the two titles as synonyms. We tend to read the Trinity back into it (and not without reason), but when Gabriel used the title with Mary, she would have heard it as, "and the holy one that shall be begotten shall be called the Messiah."
But in any case, even within a Trinitarian framework, the title "Son of God" refers to exactly one part out of three of the Trinity, and then has particular reference to His Incarnation as the King of Israel, a man. So again, the distinction remains.