Can real knowledge be found other than by science? In this unique approach to understanding today's culture wars, MIT professor of nuclear science and engineering, Ian Hutchinson, answers emphatically yes. He shows how scientism —- the often implicitly-held contrary view that science is all the knowledge there is —- acts to suffocate reason, religion, and ultimately science itself. Tracing the history of the growth of scientism alongside natural science, and their frequent confusion, Hutchinson explains the characteristics that make modern science so persuasive and powerful, but at the same time restrict its scope of application. He shows how a proper recognition of science's scope, and a proper identification of what we call nature, makes sense of both science and non-scientific knowledge like history, law, politics, philosophy, sociology, and religion. The error of scientism is responsible for much of the modern suspicion of science by large sections of society and the academy. And it underlies most of the militant atheist arguments against religion, which are here concisely refuted. Even though, as Hutchinson explains, scientism is not proved by science, and scientism as formal philosophy is largely discredited, the world-view still remains highly influential today. Often, its presumptions are held by both sides of the debate, leading to irreconcilable confrontation. But in fact modern science developed out of a Christian understanding of the world. Science has been advanced, very often, by sincere Christian believers, who did not suppose that religious knowledge, or indeed any other non-scientific knowledge was ruled out by science. Rejecting scientism enables a principled intellectual reconciliation of science with religious faith, and with the rest of knowledge.