I like the message: Simple, straight-forward, unoffensive. It targets people who are already atheists but may not know there are others like them out there.

The number of people unaffiliated with any particular faith has grown more rapidly than any other religious group in recent years. According to a 2007 Pew study, 16 percent of American adults say they don’t belong to any religion, compared to 7 percent who were raised unaffiliated.