Jillette, who claims he was a believer until he read the entire Bible, was a Congregationalist before becoming a secularist. He maintained his religious beliefs until high school and he concludes that reading the holy book from cover to cover "is the fast route" to non-belief.
MORE: http://www.theblaze.com/stories/you-cant-be-moral-believe-in-god-penn-jillette-sits-down-with-the-blaze-and-credits-glenn-beck/
See also...
The Good Book gets a rewrite
http://www.lansingcitypulse.com/lansing/article-7459-the-good-book-gets-a-rewrite.html
And...
Richard Dawkins’ Next Book to Detail His Personal Path to Atheism
http://www.theblaze.com/stories/richard-dawkins-next-book-to-detail-his-personal-path-to-atheism/