Are humans intrinsically valuable, or are they simply a cosmic accident with no real meaning or purpose? Since the Enlightenment this debate has raged in Western culture, profoundly influencing our understanding of bioethics and informing the debate over abortion, infanticide, euthanasia, genetic engineering, etc. The title of this book, The Death of Humanity, refers not only to the demise of the concept that humans are intrinsically valuable, but also to the resultant killing of actual human lives. This book explains first why the Judeo-Christian sanctity-of-life ethic has declined historically since the Enlightenment. Second, it depicts the deleterious consequences this has had on contemporary society. Third, it demonstrates the poverty of many secular alternatives to the Christian vision of humanity, such as materialism, positivism, utilitarianism, Marxism, Darwinism, eugenics, behaviorist psychology, existentialism, sociobiology, postmodernism, and others. Finally, it defends the sanctity of human life on a variety of fronts -- abortion, euthanasia, infanticide, suicide, eugenics, and transhumanism, among others. - Preface.