Well, since you asked, I consider the whole concept of God having a mother somewhat blasphemous.
I do accept that Jesus was wholly Man and wholly God. But God existed before Mary, including God the Son.
You know, I accept the doctrine of the Trinity, although I cannot explain it. One God, Three Persons. Doesn’t make sense, but I accept it. However, I find evidence of it in Scripture.
The Mother of God thing neither makes sense to me, nor do I find any evidence to support it in the Scripture.
Spoken like a good Nestorian! ;-)
This is scriptural:
People protest about the phrase theotokos “mother of God.” They should see it’s got a Biblical precedent when Elizabeth sees pregnant Mary and says, “the mother of my Lord. For behold when the voice of your greeting came to my ears, the babe in my womb leaped for joy and blessed is she who believed that there would be a fulfillment of what was spoken to her from the Lord.”
If you accept this scripture alone, Elizabeth, mother of John the Baptist, says Mary is the mother of her Lord, the fulfillment of Messianic prophesy.