Mormons believe that father God and Mary had Jesus as a result of sexual intercourse. I think this teaching is in the Doctrines and Covenants. They also believe that God was once a man and that we can become gods. There is nothing in Catholic teaching that even approaches these heresies. Mary is honored because of her yes to God and for being the mother of our savior. She is not considered a goddess or part of the Trinity. In Mary we see all the promises of God's grace fullfilled. The same promises that we one day hope to share in.