Not knowing much about evolution is the least of the average American student's worries:

[Expelled] is simply an anti-science propaganda film aimed at creating controversy where none exists, while promoting poor science education that can and will severely handicap American students.

I was not aware that there were any serious jobs outside of academic biology that required a thorough understanding of evolution in order for Americans to perform them. Clearly, piss poor science education on topics of such daily, professional importance as the big bang and evolution are the culprits behind the dearth of Americans in engineering fields and the hard sciences. Silly me, I would have put the blame on the way that public schools largely waste students' time, and tend to be run by educational and intellectual half-wits whose claim to being a professional teacher is at best usually based on a degree in education and a minor in their subject area.

Clearly the solution to making up for all of the damage that has been done to the educational process is to make American students learn evolution dogma like a secular catechism. Given the lack of critical thinking skills so present among them today, that's about the best that can be expected of the average student who is to freed from their "handicap."