My own experience in the Catholic Prison Camp I went to was somewhat different. I kid, because in actuality the Catholic Brothers were a bit more broad-minded than you'd expect. Of course, sex was supposed to be verbotten; one of those Great Mysteries reserved for the sacrament of marriage so it was only the bare mechanics, threat of disease, and
DON'T DO IT. We also suspected they were a bit liberal in dosing the food with saltpeter.
Maybe the fact that I didn't eat in the cafeteria on a daily basis was one of the reasons the brainwashing didn't take. To paraphrase Jack McCoy from
Law And Order, if you're raised Catholic, you either turn out obedient, or impertinent (in the series, McCoy was educated by Jesuits).
But when it came to science, the Brothers came down on the side of knowledge. One thing to say for a Catholic education is that you come out ready for university. Evolution was treated like any other branch of science, and they never tried to foist Creatinism or the faerytale of the Divine Watchmaker on us.
Even when it came to religious instruction, my Prison Camp was decidedly more broadminded than you'd find in Fundamentalist Prison Camps. In point of fact, the Brother who taught my senior religion class debunked the idea of Revelation as prophecy and introduced us to comparative theology.
But when it came to sex education, I had to find out for myself via the scientific method. Well and good as far as it went until I finally had the opportunity for actual experimentation, that is.
If they won't teach you, then you've got to teach yourself and start deciding whether you can actually believe what they're trying to cram down your throat or not. But it sure as hell sounds as if the school you're in equates Faith with Ignorance and tries to intill Fear as the glue holding it together, and I think you're already figuring out that its bullshit.
Go with your instincts.