The issue of whether or not there is a God is one of the oldest and most widely disputed philosophical questions. It is a debate that spreads far across the range of philosophical questions about the status of science, the nature of mind, the character of good and evil, the epistemology of experience and testimony, and so on. In this book two philosophers, each committed to unambiguous versions of belief and disbelief, debate the central issues of atheism and theism. Smart opens the debate by arguing that theism is philosophically untenable and seeks to explain metaphysical truth in the light of total science. Haldane continues the discussion by affirming that the existence of the world, and the possibility of our coming to have knowledge of it, depend upon the existence of a creating, sustaining, personal God. This is followed by replies, where each philosopher has the chance to respond and to defend his position. This second edition contains new essays by each philosopher, responding to criticisms and building on their previous work.