From an interesting article on Wikipedia about religiosity and intelligence:
All but four of the forty-three polls listed support the conclusion that native intelligence varies inversely with degree of religious faith; i.e., that, other factors being equal, the more intelligent a person is, the less religious he is.
Yeah. Well. No surprise there, eh?
Read more of the Martian Anthropologist's writings here.
ADDED MUCH LATER IN THE DAY, AFTER READING THE COMMENTS BELOW...
Hey, everyone. Thanks for all the comments. Three things I'd like to say: (1) I see I got accused of being a "troll" or a "hit and run" poster. I actually was on a plane most of the day.
(2) My comment, "no surprise there?" was just what I meant. I cannot honestly see how people giving money to folks like Jerry Falwell can be very bright. I cannot see how someone's utter lack of ability to question what they believe makes them anything but stupid.
(3) Lastly, one poster said I didn't even post any of my experiences "proving" that a lot of religious people are dumb. No, I didn't. But I could. I grew up in a very fundamentalist, rigid, Christian environment. To make a long, long, sad story short, I have seen religion ruin many people's lives. And I mean RUIN. Mine included. And please -- I'm not talking about even taking someone's money, though it was that, too, of course. I'm talking about rape, molestation, and all kinds of horrible things. And is this religion an isolated example? Of course not. Through-out history, religion has held back science, and been the enemy of rational thought. Churches TORTURED scientists for speaking the truth. And you don't think that's dumb?
I was fortunate enough to get a second chance. Not all were that lucky.