The OKCupid site dug deep into their database of users and analyzed…a lot of stuff. The interesting one is this chart of reading/writing level by religious belief.
Look there: the godless users of OKCupid score higher than the religious users; and furthermore, being more serious about agnosticism/atheism is correlated with better scores, while the more devout you are within a religious tradition, the lower your score.
Is anyone surprised by this? Not me.
We should regard these data with a little suspicion, though — OKCupid is an online dating site, so it’s not an entirely random sample of the population. It could mean that the most earnest atheists have a hard time getting a date, while the smart believers are all off getting married or indulging in wild orgies all the time and have no need of a dating service.