Don't take my word for it that Expelled is a meretricious propaganda piece - after all I haven't even seen it and have to draw inferences about it from what I read (and my own knowledge of its subject matter ... oh, and the trailer on YouTube; don't forget that). Here's a review of Expelled in the New York Times.
Good for their reviewer, Jeanette Catsoulis. She doesn't mince words: "Mixing physical apples and metaphysical oranges at every turn 'Expelled' is an unprincipled propaganda piece that insults believers and nonbelievers alike. In its fudging, eliding and refusal to define terms, the movie proves that the only expulsion here is of reason itself."