Why Strict Churches Are Strong

The strength of strict churches is neither a historical coincidence nor a statistical artifact. Strictness makes organizations stronger and more attractive because it reduces free riding. It screens out members who lack commitment and stimulates participation among those who remain. Rational choice theory thus explains the success of sects, cults, and conservative denominations without recourse to assumptions of irrationality, abnormality, or misinformation. The theory also predicts differences between strict and lenient groups, distinguishes between effective and counterproductive demands, and demonstrates the need to adapt strict demands in response to social change. In 1972 Dean Kelley published a remarkable book titled Why Conserva-tive Churches Are Growing (Kelley 1986). In it he documented a striking shift in the fortunes of Americas oldest and largest Protestant denomina-tions. After two centuries of growth that culminated in the 1950s, virtu-