Most atheist are agnostics who decided they will not arbiter if one religion is more right than other, at least that's my case and most atheist I've discussed with.
I like rites (catholic funeral and Muslim marriage would be my perfect combo) and I enjoy talking spirituality and belief systems with people who believe in one more god than I do. I think Shintoism led to the most interesting discussions in general, but Jehovah's witnesses are the most consistent ones (also I always take so much of their time and they're too polite to tell me to stuff it, I always feel bad after).
Which is deliciously ironic considering how much non-theists enjoy mocking theists "for their 'irrational' thinking".