We are living today in a genuinely frightening scenario: religion and science are engaged in a kind of war: a war for understanding, a war about whether we should have good reasons for what we accept as true. The sheer fact that over half of Americans don't believe in evolution (to say nothing of the number of Congressmen who don't believe in climate change) and the resurgence of religious prejudices and strictures as factors in politics, education, medicine, and social policy make the need for this book urgent.

Religion and science compete in many ways to describe reality - they both make "existence claims" about what is real - but they use different tools to meet this goal. In his elegant, provocative, and direct argument, leading evolutionary biologist and bestselling author Jerry Coyne lays out in clear, patient, dispassionate details why the toolkit of science, based on reason and empirical study, is reliable, while that of religion - including faith, dogma and revelation - is unreliable and leads to incorrect, untestable, or conflicting conclusions. Indeed, by relying on faith, religion renders itself incapable of finding truth.