Robert Putnam

Most Americans watch Friends rather than having friends.

Once we know how observant a person is in terms of church attendance, nothing that we can discover about the content of her religious faith adds anything to our understanding or prediction of her good neighborliness...In fact, the statistics suggest that even an atheist who happened to become involved in the social life of the congregation (perhaps through a spouse) is much more likely to volunteer in a soup kitchen than the most fervent believer who prays alone. It is religious belongingness that matters for neighborliness, not religious believing.

Nearly half of all associational memberships are church-religious context. Religious worshipers and people who say religion is very important to them are much more likely than other persons to visit friends, to entertain at home, to attend club meetings, and to belong to sports groups; professional and academic societies; school service groups; youth groups; service clubs; hobby or garden clubs; literary, art, discussion, and study groups; school fraternities and sororities; farm organization; political clubs; nationality groups; and other miscellaneous groups.