I have discussed this with the pastor before. He implied the level of control that the parents place on the kids is meant to prevent any exposure to temptation or evil. Evolution is never brought up in these conversations. Rather, issues like pornography, sex, drugs, ect. seem to be the concern. They see evil lurking at every turn, waiting to seduce their kids. It is a neurosis or hysteria.
i agree. for a year and a half of middle school i was enrolled at a christian school. aside from a single chapel (wednesday mornings) visit by the illustrious kent hovid (yes, i went to school in pensacola), the only other exposure we had to evolution in any sense was 7th grade science on the first day. we used ordinary science books and we skipped the first some chapters with a small blurb from my teacher (who i'm not sure was convinced) of "we're skipping these because we don't believe in them." (this of course led me to spend that class period reading those chapters.) however, we spent multiple bible classes and chapel sessions and even combined courses on sexual purity. in sixth grade all the boys and girls from my level were brought together and told how disappointed our teachers were that some student had claimed that he'd already 'had a girl in his bed'. we were separated after a long lecture and instructed in our separate groups about basic gender issues and how we were called to purity specific to our sex. i'm sure there was more, but i don't really remember. i was so beyond worrying at boys at that time. i had crushes, but i barely had friends.
i agree that the concerns of isolationist christians are much more complex than the anti-evolutionist agenda. evolution is easy to combat. sex isn't.