Christianity and Liberalism by J. Gresham Machen
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Machen's classic defense of orthodox Christianity established the importance of scriptural doctrine and contrasts the teachings of liberalism and orthodoxy on God and man, the Bible, Christ, salvation, and the church. Though originally published nearly seventy years ago, the book maintains its relevance today. It was named one of the top 100 books of the millennium by World magazine and one of the top 100 books of the century by Christianity Today.