I would argue that the aim of the thread (to show Americans as stupid) is just incredibly shallow. Simply not accepting evolutionary theory does not in any way take away from a person's intellectual capacity, critical thinking skills, reasoning ability, etc...

I really don't pay too much attention to people using polls to make generalizations. There have been even more offensive conclusions drawn from poll results (be they statistically sound or not) in the past (Canadians and pedophilia for example).