They don't want the kids to learn science or even mention things like evolution... Is their religion on such shaky grounds that it can't stand up to some critical thinking?
Actually, most religions claim there's an abundance of ways to fall for temptation and sin while the path to God is straight and narrow. You make it sound like making it a challenge and pointing out all the alternatives and benefits would be a good thing, while the religious consider it trying to lead the children astray and trying to put a wedge between them and God. Like say their interpretation of the Bible means sex belongs only in the marriage - bear with me on this one - then pointing out that "if you're going to have sex anyway, use a condom" is kinda upselling a sin. It leaves the impression they don't really think you'll stick with plan A anyway. So a lot of parent don't want their children to know there even is a choice. You think in terms of pros and cons, they think it's one good choice and a lot of bad alternatives they don't need to know about..