Polls
On polls like this, you have to be careful. Many questions that burn in the minds of those obsessed with one side or another of an issue don't even make the radar screen on a lot of people who have lives.
I'd bet there's a lot of people who could not care less about evolution OR creation, since its impact on their lives is exactly zero. They'll say "no opinion." Doesn't make them stupid, just means they don't need to spare the mental bandwidth.
Remember that poll about whether or not people would re-elect their congressman? Something like a third of respondents didn't know if their congressman was a Democrat or a Republican. Stupid? Or just preoccupied?