The continuing decline of the historic mainline denominations is much more than just a matter of losses from aging and growing secularization. A recent analysis by the Washington-based Institute for Religion and Democracy, an evangelical think tank, suggests that large numbers of disaffected members are switching to conservative churches. Between 1965 and 2003, the latest year full figures were available, membership declined by the following percentages: Christian Church (Disciples of Christ) shrank by a whopping 57.2 percent, to 770,793; Presbyterian Church (U.S.A), 43.5 percent, to 2.4 million; United Church of Christ, 37.4 percent, to 1.3 million; Episcopal Church, 35.8 percent,...