Yet Catholicism demands belief that Mary is the “mother of God”.
The Roman Catholic Church does hold that Mary is the mother of God, and most Catholics and some other Christians believe this.
And there are Christians, some of whom are Catholic, who do not believe that Mary is the mother of God.
This has been and will most likely continue to be a point of contention on this Forum.
It is true that Mary is not called the “Mother of God” anywhere in Scripture. It is also true that the Triune Godhead, God the Father, the Son, and the Holy Spirit, has no mother.
But if the Son is willing to come down from heaven and be born of woman, it seems that He would also be willing to consider that woman to be His mother while He was on earth. For this reason only can Mary be called the mother of God.
I have not seen a good reason put forward as to why the incarnate Son of God would not consider Mary to be His mother.
If the term "mother of God" were correct and appropriate those would have been the words he Holy Spirit would have had used. He didn't. Catholics may want to take the hint.