Let me reword this and take the word "God" out of there and use "Divine being" instead.
Allend said:
The confusion is on the part of folks who try to divide Jesus in two, the human Jesus and the divine Jesus, and say that Mary was the mother of the first but not the second.
So if Mary is mother of both, she pre-existed with Jesus in heaven right?
The Trinity is made up of :
God the Father, Christ the Son, and the Holy Spirit ?
or
God the Father, God the Son, and God the Holy Spirit?
.
Which do you choose? Your previous answer implies a seperation between "Christ" and "God".
There is no both. There is only One Son of God. And His mother is fully human, fully mortal. The implication of this truth, the truth that is the central miracle of Christianity - the Incarnation, is that His mother is the Mother of God.
Your mistake is in projecting normal, mortal rules of what motherhood means on to the ever-unique event of the birth of God from a mortal woman. Among mortals, the mother of course pre-exists the child. But if the Child is God, this does not apply.