Robert Putnam is famous for Bowling Alone, his study of declining social capital in America.
American Grace is his major follow-up study, in which he was looking for what does hold America together. He concluded that religion actually does hold us together (which is does not do in some countries). This is an encouraging conclusion, more encouraging that Bowling Alone.
In fact, Putnam and Campbell said that “praying together seems to be better than either bowling together or praying alone.”