PZ Meyers was unsatisfied by the study released yesterday:
All the low frequency of self-reported atheists in the survey tells you is that the long-running campaign in American culture to stigmatize atheism has been highly successful — and it's an attitude that we still see expressed in reports like this. The most important news they try to transmit is not the increase in unbelievers, it's "Thank God they aren't atheists! They're just rational skeptics, instead!"
James Joyner pipes up:
I suspect part of the reason that people are reluctant to call themselves “atheists” is a fear of being lumped in with the likes of Myers, Christopher Hitchens, and Richard Dawkins. Not satisfied to use their considerable brainpower to argue for scientific explanations over supernatural ones, they instead show utter disdain for the overwhelming majority of their fellow citizens who were brought up in a religious tradition and cling to parts of it. “Atheism” in this sense isn’t a mere belief that there is no supernatural overlord controlling our universe but a quasi-religion of its own, with many of the worst traits of organized religion.
Similarly, AllahPundit likes the trend but is baffled by the non-believers who have a “personal god” or otherwise quasi-religious beliefs. But that strikes me as a cultural phenomenon rather than a purely religious one.