Blasphemy? No, not even by the logic you are using.
So how do we follow logic? Was it from our own interpretation or from the Bible?
If you believe God became flesh as Jesus, and Mary was his mother, it follows that Mary was the Mother of God in the flesh, Jesus.
You need to separate the Word/God, i.e., from ETERNITY, from the flesh, i.e., STEPPED INTO TIME, to avoid confusion.
I believe the Word/God became flesh based on John 1:14. When the Word, who was God and “was with the God/Father” became flesh, He, the Lord Jesus, became the Son of Mary in the flesh and NOT the Son of Mary from ETERNITY where the Word/God was in the beginning with the God/Father. Here is a verse that you could read:
“concerning His Son, who was born of a descendant of David according to the flesh,” –Romans 1:3.
You need to see the transition from ETERNITY “and the Word was God” –John 1:1c, where Mary was
NOT, to TIME “and the Word became flesh” –John 1:14, where Mary was, because if you don’t then it will be questionable, i.e., if Jesus is God why did He die, God does not die, so in order for God to die He must become flesh like us.
Read these verses as well:
Phil 2:5 Have this attitude in yourselves which was also in Christ Jesus,
Phil 2:6 who, although He existed in the form of God, did not regard equality with God a thing to be grasped,
Phil 2:7 but emptied Himself, taking the form of a bond-servant,
and being made in the likeness of men.
Phil 2:8
Being found in appearance as a man, He humbled Himself by becoming obedient to the point of death, even death on a cross.
“
even death on the cross” God does not die so the Word/God must become flesh to die.