Why do you think religious beliefs are such a sensitive topic for parents?

I mean, there are lots of things I disagree with in the "mainstream." I'm a fairly strong atheist, but religion isn't one of my hot topics. I find it more objectionable that unproven hippie-dippie-yippie science is taught in schools. I think that's more dangerous than trying to get heathen kids to believe that the Earth was created by some dude in a robe on a cloud a few thousand years ago.