This article deals with the design argument for the existence of God as it is discussed in hume's "dialogues concerning natural religion". Using bayes's theorem in the probability calculus--Which hume almost certainly could not have known as such--It shows how the various arguments advanced by philo and cleanthes fit neatly into a comprehensive logical structure. The conclusion is drawn that, Not only does the empirical evidence fail to support the theistic hypothesis, But also renders the atheistic hypothesis quite highly probable. (...) A postscript speculates upon the historical question of hume's own attitude toward the design argument. (shrink)