Roof's newest book, Spiritual Marketplace: Baby Boomers and the Remaking of American Religion, argues that today's "born again" Christians are united by emotions and experiences, not be shared doctrines or moral beliefs. One-third of America's 77 million baby boomers identify themselves as born-again Christians, but only 5 percent of those have any link to a conservative Protestant denomination. Half say that religions other than Christianity are "equally good and true," and one-third of born-again boomers believe in reincarnation and astrology. Nearly half support abortion.