Actually some do, though RC's are definitely all over the map on all doctrines, contrary to their claim. They believe her to be the wife of the Holy Spirit, therefore the Wife of God, therefore equal to anything anyone might think of as a Heavenly Mother.
There is absolutely no Catholic doctrine that says that Mary is the wife of God, the Holy Spirit. Mary was the wife of Joseph and he is the only husband she ever had, if you can find Biblical evidence of something else let me know. I will be the first to acknowledge that many Catholics (as well as members of all other Christian denominations) have misconceptions about what Christianity is and isn't. You yourself have said that you were converted to Christianity in an instant (which I fully believe to be true, as I have known many people who underwent such experiences); however, you said that you did not read the Bible for over a year after this conversion -- what if some of the things you were told about Christianity in that period had been incorrect? It is the same thing with Catholicism, people are sometimes misinformed about things and they have not been told the truth.
Mary is called "blessed" three times in the first chapter of Luke (by the angel Gabriel, by Elizabeth and by herself), in fact she is referred to as "blessed" AMONG women and we are told that henceforth ALL generations shall call her "blessed". Assuming you agree that the Bible does say this, I have a few questions:
1. Were Adam and Eve created free from Original Sin?
2. If Mary is "blessed among women" does that mean that she is superior to Eve in all ways?
3. Do you believe and so proclaim that Mary is blessed?
Mary was NOT Heavenly Mother.