In general, the higher your IQ and the more education you have, the greater the probablity that you'll not believe in god. Therefore, in general again, atheists tend to be very bright, well educated people, people to whom reasoning and ideas are very important.
True enough. But what I find intriging, is that there are people with PhD's who believe in God. These are educated people who have been taught to think and reason. I don't want this thread to become another rant between believers and non-believers, but I found this thread very interesting:
http://www.livescience.com/strangenews/050811_scientists_god.html