Written by Martin D. Jaffe, M.D. Jaffe uses the principle that the quest for security underlies all of evolutionary biology and psychology to ultimately establish proof against the existence of God.

Written by Sam Harris. Harris argues that human morality is determined by scientific principles.

Dr. David Doukas is a faculty member in the Institute for Bioethics, Health Policy and Law, and he holds the William Ray Moore Endowed Chair of Family Medicine and Medical Humanism at the University of Louisville. He is a co-author of Planning for Uncertainty: Living Wills and Other Advance Directives for You and Your Family.

Written by Betty Brogaard. Brogaard describes her personal experience questioning her Christianity and her spiritual journey from religion to freethought.

Written by Dan Barker with a forward by Julia Sweeney. Barker writes about how Atheists experience their sense of purpose in life.

Written by John W. Loftus. Loftus, a former evangelical minister, encourages skepticism in evaluating faith and describes Biblical errors and fallacies.

Kenneth W. Goodman is a professor of medicine at the University of Miami and the founder and director of the University of Miami Bioethics Program and its Pan American Bioethics Initiative. He is also the co-director of the university’s Ethics Programs.

Written by Michael Palmer. Palmer explains the basic philosophical arguments behind Atheism.

Lars Noah is a law professor at the Fred G. Levin College of Law of the University of Florida in Gainesville and author of Law, Medicine and Medical Technology: Cases and Materials, 2nd ed. (Foundation Press, 2006).