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.
J. Gresham Machen (1881-1937) was professor of New Testament at Westminster Theological Seminary, Philadelphia, Pennsylvania. In 1936 Machen was instrumental with others in founding what became the Orthodox Presbyterian Church, and was its first Moderator.