What do you mean "mother of Jesus, as OPPPSED to mother of God?" They are innerchangeable. I thought all Christians accept the belief that Jesus IS God made man. Are you saying Jesus wasn't divine?
Of course Catholics says Mary is the Mother of God, because Jesus is God the Son... God incarnate. (and to my knowledge, nobody has ever said Mary gave birth to God THE FATHER.) But if you think Mary ONLY gave birth to some guy named Jesus of Narazeth, I think you'd be Jewish, not Protestant or any other kind of Christian.
The belief of the trinity seems to be a universal Christian idea -- every branch of Christianity should accept that Mary's son was God.
I have no argument with how you stated your case. All Christians agree that Jesus is the Son of God. Would it not be more accurate to say that Mary is the Mother of the Son of God?