Okay. Now I've heard everything: According to a Pew Forum report 21 percent of atheists believe in God. Not only that, but, as the blog "Hot Air" has pointed out, the same report indicates that, in addition, 12 percent of atheists believe in heaven and 10 percent pray at least once a week.
I'm trying to imagine what an atheist prayer would sound like, but nothing is coming to me. Obviously these are not very good atheists, and are in need of some remedial atheist training, in Lesson 1 of which would be instruction on the concept that atheists don't believe in God and so it's probably not too terribly useful to pray to him.
Thanks to Polysemy, a great little blog, for spotting this. Here are the numbers from the Pew Forum: