The new free dating site OKCupid.com did a study of what works and what doesn't work when writing your profile. Down at the bottom of the article there's a big surprise: Those who mentioned "atheist" in their profile had a much better chance of getting a reply when they contacted someone else! Here's a link to the article.
It's not clear exactly what their graphs mean, but the trend is clear.
I have to wonder if this isn't just an artifact of their demographics. OKCupid.com has been marketed heavily to the young, tech-savvy crowd, which is notoriously unreligious. Those in this group with faith typically don't attend traditional Christian churches. They're more of the "spiritual but not religious" crowd.
Still, it's interesting news.