The term *mother of God* does not show up in a keyword search of the Bible.
However, THIS term does, as used and inspired by the Holy Spirit....
John 2:1 On the third day there was a wedding at Cana in Galilee, and the mother of Jesus was there.
John 2:3 When the wine ran out, the mother of Jesus said to him, They have no wine.
Acts 1:14 All these with one accord were devoting themselves to prayer, together with the women and Mary the mother of Jesus, and his brothers.
That doesn't pass the "so what" test. Even assuming you have a valid English translation ipsissima vox Deus is far more relevant than ipsissima verba scriptura.
Is your argument that Jesus was/is not God?