Nielsen (philosophy, U. of Calgary) presents a defense of naturalism as the most reasonable way to view humans place in the world. His naturalism is an atheistic and humanistic philosophy, but it is not a scientific or value-free one. He articulates a naturalistic explanation of the functions of religion and argues that truly understanding religion necessitates disbelief. He argues that a consistent atheism does not "rob life of its significance or make social and political commitment arbitrary." After explaining the theory he explains arguments for and against the theory as propounded by various other philosophers, most notably the work of Wittgenstein, which he believes to be the most serious philosophical challenge to secular naturalism. Annotation c. Book News, Inc., Portland, OR (booknews.com)