Across the English-speaking world the numerical decline of mainline Protestantism is accelerating. The largest mainline Protestant denominations in the United States are the United Methodist Church, the Evangelical Lutheran Church in America, the Presbyterian Church (U.S.A.) and the Episcopal Church. Collectively, membership in these denominations decreases by about 1 million a year, resulting in hundreds of church closures annually...We tracked down an elusive sample of growing mainline congregations and compared them to a sample of declining congregations. We surveyed more than 2,200 of the congregants, half attending growing churches and half at declining churches, and the clergy who serve them...We found, without exception, the clergy and congregants of the growing mainline Protestant churches held more firmly to traditional Christian beliefs...
From Why conservative churches grow and liberal churches shrink in the Dallas Morning News