This is not surprising since he is an atheist (I suspect he might be a Richard Dawkins type of atheist):

Bad Boy Bill Maher, someone who has never had Belief, has never ever been aligned with Devotion, Divinity, Prayer, The Supreme Power. He has now teamed with even badder boy Larry Charles, director of that epic “Borat: Cultural Learnings of America for Make Benefit Glorious Nation of Kazakhstan.” These two have co-created an inflammentary. That’s a documentary sure to inflame whoever sees it. We’re talking a scathing, searing, stabbing attack on religion. Anybody’s. Everybody’s. Hysterically funny, it is the most sacrilegious movie ever made.
The man makes Michael Moore into a moderate. This gem, which should drop on us in six months, will rate four fires in hell.
Maher’s inflammentary is so far untitled. The whole schmear was his idea. He’s worked on it six months. Paramount put the money up. In Brad Grey’s pre-Paramount Pictures chief days, he was Bill’s agent. Maher shot this film in Jerusalem, Stonehenge in England and God (excuse the expression) knows where else. He’s interviewed all of today’s great religious minds. He did it in secret. Maybe because he’s afraid we’ll all stone him, he still wants this kept secret.

(via)