Yep - He will learn all about that. The question for yourself is: Does learning this outweigh learning reading, writing and math in a safe and structured environment where you will not have to worry about your son's safety or PC crap being taught.
I am a devoted Jew, and yet the answer to your beautifully posed question is this: NO. (Right? The answer is no, isn't it?) It is FAR more important for my son to be in a safe, OBJECTIVE VALUES-based school where he will not be indoctrinated with the PC crap. I would far rather he learned Catholicism than the LIES of subjective morality and liberalism.
Thanks.