I, in turn, have no idea how people like you can allege, with an apparent, sincerely-held belief, that we Catholics believe such nonsense. You have been on this forum for nearly 2 years. If you had been paying even the slightest bit of attention, you would certainly know that your assertion, quoted above, is utterly false and slanderous. There are enough genuine differences of belief between us that you don't need to make-up others or perpetuate the clearly erroneous accusations of other ignorant people.
As for Mary's having other children or not, I would simply point out, at this late hour, that the issue is not nearly as cut-and-dried as you smugly suppose. There is room for honest people to have honestly varying opinions here, but I suspect that, just as you are so ignorant of Church teaching that you suppose we Catholics "worship" Mary as part of the "Godhead," it is equally likely that you haven't ever even bothered to barely look into Catholicism's reasons for asserting Mary's perpetual virginity, too. As you speak from ignorance on her status quite outside of the Godhead, you speak from ignorance while denying her virginity after Christ's birth. You do her and her Son insult, on at least two levels.
One can have NO 'opinions' over this; can they?
NIV Matthew 12:46-50
46. While Jesus was still talking to the crowd, his mother and brothers stood outside, wanting to speak to him.
47. Someone told him, "Your mother and brothers are standing outside, wanting to speak to you." 48. He replied to him, "Who is my mother, and who are my brothers?"
49. Pointing to his disciples, he said, "Here are my mother and my brothers.
50. For whoever does the will of my Father in heaven is my brother and sister and mother."