This massive book eschews the narrow, monographic approach to sociological study in favor of an older, more useful model: the sweeping chronicle of national change over time. Harvard professor Putnam (Bowling Alone) and his University of Notre Dame coauthor Campbell (Why We Vote) argue two apparently contradictory theses persuasively: first, that a "new religious fault line" exists in America, a deep political polarization that has transcended denominationalism as the greatest chasm in religious life; and second, that the culture (especially its younger generation) is becoming so much more accepting of diversity that thesis #1 will not tear America apart. The bulk of the book explores in detail cultural developments--the boom of evangelicals in the 1970s and 1980s, largely concluded in the early 1990s; the rise of feminism in the pews; the liberalization of attitudes about premarital sex and homosexuality, especially among the youngest generations; and what may prove to be the most seismic shift of all: the dramatic increase of "nones," or people claiming no institutional religious affiliation. Putnam and Campbell (with their researcher, Garrett) have done the public a great service in not only producing their own mammoth survey of American religion but also drawing from many prior statistical studies, enabling readers to track mostly gradual change over time. (Oct. 5)