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Is religion a virus of the mind? Three mental health experts join us.

Dr. Andy Thomson is a psychiatrist, a trustee for the Richard Dawkins Foundation for Reason and Science, on staff with the University of Virginia, and author of "Why We Believe in God(s): a Concise Guide to the Science of Faith."

Dr. Valerie Tarico is a psychologist, columnnist for AlterNet, and author of "Trusting Doubt: A Former Evangelical Looks at Old Beliefs in a New Light."

Dr. Darrel Ray is a psychologist, co-founder of Recovering From Religion, author of "Sex & God" and "The God Virus," and host of the Secular Secuality podcast.