Contrary to popular (if you can call slashdot popular) opinion, in my experience, kids who go to religious schools tend to know more, not less about evolution than kids that go to public schools. The kids are given both viewpoints, and also contrary to popular opinion, kids are able to form their own opinions. They end up performing better on tests for a variety of reasons, including family support, likely being more affluent, and other factors, but also, they perform because they are given more information and must come to their own conclusions. More information is better. Unless it was completely one sided, the fact that multiple ideas are shared is a good thing.
Undoubtedly there are some extreme fundamentalist schools that are the outlier, but most religious schools teach about the same subjects as a public school (in fact, they are required to do so), plus teach other topics that would not be taught in public school, and this only serves to broaden the minds of the students. The results are clearly seen in standardized test scores.