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Robert D. Putnam, Peter and Isabel Malkin Professor of Public Policy, polled a group of 3,000 Americans in 2006 and again in 2007. The comprehensive surveys, combined with case studies of 13 churches across the country, provided the backbone of his book “American Grace.”  What the data showed, Putnam said, is that America is a remarkably devout, religiously diverse, and surprisingly tolerant place.

Church of one

Fewer Americans identify with a particular religion, Putnam finds