I read today about an atheist blogger that has just converted to Catholicism. Twisted, I know. I first came across it at Blag Hag on Freethought Blogs. I then went to the blog itself and read through her post and the comments and her responses. I recommend checking it out here. It is very interesting. This is the first I have heard of an atheist converting (reverting?) to a religion. I mean, I am sure it happens, I just haven't seen it before myself outside of the occasional guy who says he was an atheist demon summoner. Anyhow, looking at it, I think I agree with her atheist friends that her problems started when she decided to be a virtue ethicist. Looking for absolute morality will get you every time. I actually think that believing in absolute morality is a dangerous thing in a very real sense.
If you go, check out the comments; the ones she has replied to anyhow. Reading their arguments, I really feel like the "mysteries" of religion, the things that make the religious go, "whoa!", really are what you get when a rational person seriously attempts to wrap their brain around a concept that makes no sense.