"If you could reason with religious people there wouldn't be any religious people" - Hugh Laurie.
As cool as it would have been for Hugh Laurie to say this, it was actually said by House, and the actual quote is -
Rational arguments don't usually work on religious people. Otherwise there would be no religious people."
(http://www.twiztv.com/scripts/house/season4/house-402.htm Season 4, Episode 2)
An article in the Tech Review goes into more detail."