Richard Dawkins now has a superb review of Expelled over on his site - which, unfortunately, seems to have been overloaded with traffic all morning.
The best part of the review, when you can actually read it, is his cogent response to one of the main points that Expelled evidently tries to make in a ham-fisted way: that Darwinian evolutionary theory leads to Nazism. Dawkins says it better than I can, but his point is something like this. Yes, Hitler may have been influenced by some garbled version of Darwinian theory, to which he added a good dose of Humean fallacy, thus producing one ingredient in the racist, totalitarian witches' brew of Nazi ideology. That by no means entails that Darwinian theory leads to Nazism. It also has nothing to do with whether the essentials of Darwinian evolutionary theory are actually true. (And while it likewise doesn't disprove the truth of Christianity, Hitler is likely to have been influenced at least as much by the long history of anti-Semitism in Germany, founded on Christian hostility to the Jews.)