If one believes that Jesus is God, then Mary is the mother of God. Those that believe Jesus is not God, then Mary is the mother of Jesus. It is what it is.
Jesus is God, but Jesus also sits at the right hand of God. They are the same, but yet they are separate. Can man really comprehend this relationship? Saying Jesus is God is Biblical, but does Jesus encompass all that God is? Who knows. My point is stick what is in the Bible and don't try to extrapolate based on human knowledge.