In this updated, expanded edition, starting with Freud's 'projection theory' of religion - that belief in God is merely a product of man's desire for security - Professor Vitz argues that psychoanalysis actually provides a more satisfying explanation for atheism. Disappointment in one's earthly father, whether through death, absence, or mistreatment, frequently leads to a rejection of God. A biographical survey of influential atheists of the past four centuries shows that this 'defective father hypothesis' provides a consistent explanation of the 'intense atheism' of these thinkers. A survey of the leading defenders of Christianity over the same period confirms the hypothesis, finding few defective fathers. Vitz concludes with an intriguing comparison of male and female atheists and a consideration of other psychological factors that can contribute to atheism. Professor Vitz does not argue that atheism is psychologically determined. Each man, whatever his experiences, ultimately