This is where I come in. I've heard the term "mother of God" used quite a bit. I must also say that NOBODY has ever said that Mary is the mother of the Trinity (Father, Son, Holy Spirit). Who is Jesus? Answer: God. I have no problem with the term "mother of God" if it is being used to defend the deity of Christ. Check this out. It does talk about some of the translation difficulties. http://en.wikipedia.org/wiki/Theotokos Again, I've never run into a Roman Catholic that says Mary is the Mother of the Trinity. But there is a lot we can learn from Mary: A messenger came, she believed, and God was in her.