Skeptics unite: You have nothing to lose but your inhibitions. That, in sum, is the underlying message of Bill Maher and Larry Charles' brilliant, incendiary "Religulous," in which comedian/talkshow host Maher inquires of the religious faithful and finds them severely wanting.

Skeptics unite: You have nothing to lose but your inhibitions. That, in sum, is the underlying message of Bill Maher and Larry Charles’ brilliant, incendiary “Religulous,” in which comedian/talkshow host Maher inquires of the religious faithful and finds them severely wanting. By providing an example to other non-believers, Maher is, um, hell-bent on launching an even more aggressive conversation on the legitimacy of religion than he has on HBO’s “Real Time With Bill Maher.” Sure to be a major talking point in Toronto and destined for tons of free media, docu looks primed for serious numbers in theatrical and vid heaven.

Set to open Oct. 3, the Lionsgate release just wrapped a one-week Oscar-qualifying run at theaters in New York and Claremont, Calif., in advance of its Toronto fest premiere.

The only recent comparable example of entertainers venturing into such serious cultural-political territory is Penn & Teller’s Showtime series, “Bullshit!,” which skewers sacred cows from a skeptical-libertarian perspective. Charles’ previous smash, “Borat,” used funnyman Sacha Baron Cohen to make satirical/political points, but the particular intensity and seriousness of Maher’s project are nearly unprecedented. Indeed, its arrival shortly after the death of George Carlin — a profound influence on Maher’s standup act and politics — suggests the kind of film Carlin might have made in his prime.

Standing at the spot where believers say Armageddon will be waged — Megiddo, Israel — Maher opens his case with a warning that those who believe in a so-called “end of days” may be making a self-fulfilling prophecy. Scene also suggests the considerable globe-trotting Charles, Maher and their crew did for the film, from heartland America to Amsterdam to the Holy Land to the Vatican, and also establishes Charles and lenser Anthony Hardwick’s method of covering every segment with two cameras.

Maher devotes the first hour to the Christian faith, weighted toward evangelism, with amusing personal recollections of growing up Catholic with a Jewish mom. Not missing a beat, he even interviews his mom, Julie (who died after filming), and sister, Kathy, in the New Jersey church they attended, uncovering exactly why his parents left the church — their use of birth control.

In a string of frank, often hilarious but always well-considered conversations with various Christians, Maher incisively asks them what skeptics always ponder about religion in general and Christianity in particular. To John Westcott of Exchange Ministries, which tries to “convert” gay men, Maher asks, given that Jesus never once talked about homosexuality, why is it such an issue for New Testament Christians? To churchgoers in Raleigh, N.C., he notes there’s no firm proof that Jesus Christ ever actually lived. Perhaps most profoundly, he asks Sen. Mark Pryor (D-Ark.), a devout evangelical, “Why is faith good?”

To the film’s credit, Maher never engages in Michael Moore-style gotcha tactics, but rather asks questions that raise more questions, in the form of a Socratic dialogue. To believers expecting a blind hatchet job, this will prove both thought-provoking and a bit disarming; skeptics may be surprised (as Maher is) by the occasionally smart replies to his queries.

Pic gets in satirical digs at all faiths — and yields some of its biggest laughs — with clever inserts of clips from movies and other sources spinning off the topic at hand, be it fantastical Biblical tales, Mormon beliefs or the number of empires that have invaded Israel. Snarky subtitles are often inserted underneath conversations, meant to undercut the interview subject.

Latter section turns to Judaism and Islam, of which Maher is an equal-opportunity critic. Jewish laws around the Sabbath come in for some heavy ribbing, while the current wave of violence by wings of Islam is faced head-on. Chats with Muslims, from rapper Propa-Gandhi to scholars at the holiest Jerusalem sites, expose an internal debate raging among contemporary Muslims.

While he examines the Big Three religions of the West at length (Eastern faiths get a pass in “Religulous”), Maher even gets in some choice stabs at Mormonism (whose tenets may astound those not in the know) and Scientology.

Ending minutes, though, will catch auds up short: Suddenly, the laughs die down, and as in his closing monologues on “Real Time,” Maher turns deadly serious with a final statement that will stir raging arguments in theater lobbies.

Considering he was once a minor comic and a supporting thesp in generally awful film comedies, Maher’s transformation into one of America’s sharpest social critics is remarkable. He takes no script credit, but his periodic monologues to the camera are undeniably written, and written well.

Charles basically lets Maher do his thing, and does little other than record scenes as they happen. Tech credits of significant note belong to editors Jeffrey Werner, Jeff Groth and Christian Kinnard, who have assembled what must have been a daunting pile of footage into a notably sharp and smooth-running feature that never lags for a second. Behind the scenes, the research team of Robyn Adams, Chelsea Barnard and Sophie Charles supports Maher with considerable data.

Religulous

Production

A Lionsgate release of a Lionsgate Films/Thousand Words presentation of a Thousand Words/Bill Maher production. Produced by Bill Maher, Palmer West, Jonah Smith. Executive producer, Charlie Siskel. Directed by Larry Charles.

Crew

Camera (Deluxe color), Anthony Hardwick; editors, Jeffrey Werner, Jeff Groth, Christian Kinnard; sound (Dolby Digital), Scott Harber; supervising sound editor, Geoffrey Rubay; re-recording mixer, Rubay; researchers, Robyn Adams, Chelsea Barnard, Sophie Charles; associate producers, Alexandra Lambrinidis, Lisa Rudin; assistant director, Dale Stern. Reviewed at Laemmle's Claremont 5, Claremont, Calif., Aug. 20, 2008. (In Toronto Film Festival -- Special Presentations; Traverse City Film Festival, Michigan.) MPAA Rating: R. Running time: 101 MIN.

With

Bill Maher, Julie Maher, Kathie Maher, Andrew Newberg, John Westcott, Sen. Mark Pryor, Jose Luis de Jesus Miranda, Steve Berg, Ken Ham, Francis Collins, Jeremiah Cummings, Mohammad Hourani, Father Reginald Foster, Mohammed Junas Gatfar, Rabbi Dovid Weiss, Rabbi Schmuel Strauss, Dean Hamer, Rev. Terre van Beverren, Propa-Gandhi, Ray Suarez, Geert Wilders, Fatima Elatik, Father George Coyne, Tal Bachman, Bill Gardiner, Larry Charles. (English, Spanish, Arabic dialogue)

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