Religion can be a very negative force in the world. This book shows how to effectively challenge religious belief in a non-confrontational way using basic philosophy, historical evidence, and scientific knowledge. It exposes the flaws of religion's most fundamental premises, summarizes its poor historical record and lack of trustworthiness, and briefly reviews the growing evidence that many Bible stories are based on natural phenomena. The state of scientific knowledge in fields including cosmology is shown to eliminate the need for supernatural explanations of anything. It explains how to guide Believers to a greater appreciation of skepticism and scientific methodology, and how to use the philosophical maxim of Occam's Razor to cut through religious sophistry. It presents many common Believer fallacies, including misunderstandings of evolution, and provides the facts that refute them. It also presents the most incisive questions to ask Believers, based on simple facts and logic, and proven effective. This revised and expanded second edition addresses reviews of the first edition, including showing how Believers often fail to properly distinguish between religion and morality.