According to Amazon:
I haven't watched it yet either, but a few members of my local CFI affiliate, FreeThought Fort Wayne did. Many of us had doubts about the movie beforehand since Maher isn't exactly a paragon of rational thinking (he's an anti-vaxer among other things) but the general verdict was that it was surprisingly good. Here's a review one of our members wrote:
Religulous isn’t the boring Jay-Walking skit I feared it might be. It’s much better than that, and I wonder about the critics who say it wasn’t funny. I was laughing several times, as was most of the rest of the crowd, because of the absurdity of the subjects and because of the well-timed jokes that point that absurdity out. The jump cuts and fast editing are there, but they’re not malicious; they just inject context to what are usually one-sided, contextless conversations. And the targets are mostly frauds or idiots who have voluntarily put themselves in the public sphere, by getting a Rev. before their name, or opening a creationism museum, or being a Senator, or running to Iran and meeting with Mahmoud Ahmadinejad, or running an ex-gay counseling service, or playing Jesus in the public shows at Jesus Land. Or claiming to be the Second Coming of Jesus personally.
There was a little Michael Moore-ish grandstanding,
...But there’s enough meat there to overshadow the sparse bits of egotism and amateurism. He’ll give subtitles exposing the lies of the opulently dressed megachurch megapastor as the guy speaks; he’ll interview Catholic priests (including the Vatican astronomer) who giggle at the idea of hell and Creation and all the stuff their flock is goaded into taking literally; he’ll get the Senator to equivocate on evolution, he’ll hammer at the Jesus actor, past all the “God-sized hole in your heart” rhetoric, until the guy pulls out Pascal’s Wager; he’ll show you the salesman for the crazy kosher workless wheelchair—and he’ll do it with that affable, I’m-on-your-side schtick that disarms his opponent.
Full review:
http://freethoughtfortwayne.org/2008/10/06/religulous-better-than-i-thought