Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Key insights for Mainline decline.

An insightful and enjoyable survey of the people and ideas which split the Presbyterian Church in the 1930s. Through careful research and a captivating style, Longfield studies indepth the main characters of the Fundamentalist/Moderist controversary in the Presbyterian Church. Sympathetic to both sides, he shows how relaxing theological standards began to blunt the church's ability to speak to its members and society. Important reading for anyone trying to discover the roots of decline in mainline churches in America today.