Graham Oppy examines contemporary arguments for and against the existence of God. He shows that none of these arguments are persuasive enough to change the minds of those participants on the question of the existence of God. His conclusion is supported by detailed analyses of contemporary arguments, as well as by the development of a theory about the purpose of arguments, and the criteria that should be used in judging whether or not an argument is successful. Oppy discusses the work of a wide array of philosophers, including Anselm, Aquinas, Descartes, Locke, Leibniz, Kant and Hume, and more recently, Plantinga, Dembski, White, Dawkins, Bergman, Gale, and Pruss.