The film used the fake working title "A Spiritual Journey" in order to obtain interviews with religious leaders. They did not know that Bill Maher was involved in the film until he arrived for the interviews.
Additional people interviewed on the "Deleted Scenes" section of the DVD release: . Howard Bloom (anti-Muslim Jew, author of "The Lucifer Principles") . M. Hasan, store owner; Kaya Bousquet, model; and Jason Alper, stylist; Zamzan Books and Burkah Store (discussing Muslim fashions) . Benjamin Creme (British author, artist and prophet) discussing Maitreya . David Icke (author, "The Biggest Secret," "Secrets of the Matrix") arguing that the world is being run by "interdimensional" reptile-like creatures including the Bushes and the British royal family . Rael and followers (discussing their "atheist religion" that extraterrestrials called "Elohim" created all life on earth) . Michael Bray (anti-abortion activist from Wilmington, Ohio defending violent attacks on abortion providers even if uninvolved people are also hurt or killed) . Anne, Heidi, Carla, Doris Deborah, Michelle and Miranda (polygamist wives of a fundamentalist Mormon living in Salt Lake City, Utah)
Originally scheduled for release in March 2008 to coincide with the Easter holiday. But the 2007 Writers Guild strike caused delays in post-production. The release date was pushed back to July 11, 2008 and finally, October 3, 2008.
During the sequence set inside the Dome of the Rock, Bill Maher and his guide are approached by two men who speak in Arabic and are supposedly objecting to Maher's presence. In reality, what they are saying is "We don't normally hang out here..." and "The boss only gives us five minutes..."