Bunyon said:
When discussing a title that the catholics use for Mary, you don't think other titles used by the catholic church would have a bearing on the title in question.
That's a sloppy way of reasoning. It's possible for the Roman church to be right about Mary in some ways (calling her the "Mother of God" or the "Blessed Virgin," understood properly, are wholly appropriate) and wrong in other ways (the "Immaculate Conception," her perpetual virginity).
What you seem to be saying is that if we agree with the Roman church on one thing, we have to agree with all the rest.