Check out Off-the-map and the the eBay atheist.
I know most people have already blogged this, but I find this very interesting and informative. We get enamored with our "Religiosity" and forget how people on the "outside" view us.
Hement, the atheist, sold his "church" time to the highest bidder. Off-the-map "bought" him and is having him attend and evaluate different churches in and around Chicago. Hement is very honest, very open to understand, and very insightful.
Check out the blog, you might learn something.