For people who like church except for the parts about God, a British couple have bodied forth a new denomination that cheerfully excludes him, raising the volume on the question “What is atheism?” several decibels overnight. The Sunday Assembly, a “godless congregation” founded in East London last January by standup comedians Sanderson Jones and Pippa Evans, now boasts affiliates in Brighton, Bristol, Oxford, Canberra, Melbourne, New York, and Portland, Ore. On September 21, it announced a “global missionary tour”: This past fall, interested individuals in 22 cities across the Anglosphere held Sunday Assembly meet-ups. Look for permanent congregations to be...