They know that. They cannot bring themselves to admit that the Catholic teaching on this is exactly what they believe, so they keep trying to change Catholic doctrine so they can disagree with it. Contrarians all.
Love,
O2
I don't think "they" want to change Catholic doctrine one bit.
Catholicism does that enough on its own. Changing adding etc.
Rather they would have you learn about the Gospel of Christ as presented in the Bible.
Perhaps the true reason for the disagreement is that many Catholics don't believe non-catholics should be able to disagree with what Catholicism declares? To coin a phrase, what difference does it make? You've said in this thread that you don't have a problem with it if people don't believe in the title "Mother of God" as long as they don't reject the central tenet of Christianity concerning the deity of Jesus Christ. Did you mean it? So it's not contrarianness at all. The reason I reject calling Mary that is simply because it is an inaccurate one, it is not taught in the Bible and it has enabled the creation of a cult of Mary which takes away from the glory due to Christ.