False dilemma
1)Not all Persons have mothers (Adam had no mother)
2)Persons who have mothers also have beginnings
3)God has no beginning
4)God can not have a mother
5)Jesus is God
6)Jesus is a Human
7)As God, Jesus had no beginning
8) As God, Jesus had no mother
9) As Man, Jesus had a beginning
10)As Man, Jesus had a mother
11)Such a mystery is an unexplainable paradox in Scripture, just as the mystery of the trinity is.
It is not a dilemma; it is a deductive argument. If Mary is the mother of P, and P is God, then it necessarily follows that Mary is the mother of God. The only way to avoid that conclusion is to reject one (or both) of the two premises. Which premise do you reject?
-A8