New York Times International Bestseller In the seminal text on atheism in the twenty-first century, renowned scientist Richard Dawkins examines the irrationality of believing in God and the grievous harm religion has inflicted on society. From the sex-obsessed tyrant in the Old Testament to the more benign Celestial Watchmaker favored by some Enlightenment thinkers, Dawkins rigorously analyzes God in all his forms, eviscerating the major arguments for religion and demonstrating the supreme improbability of a supreme being. His argument steeped in impressive historical and contemporary evidence, spanning from the Crusades to 9/11, Dawkins shows how religion fuels war and foments bigotry, and makes the compelling case that belief in God is not just wrong but potentially deadly. As a solution, Dawkins offers exhilarating insight into the advantages of atheism for the individual and society, not the least of which is a clearer, truer appreciation of the universe's wonders than any faith could ever muster.