Christianity, just as much as Islam, teaches children that unquestioned faith is a virtue. You don't have to make the case for what you believe. If somebody announces that it is a part of his 'faith', the rest of society .. is obliged .. to 'respect' it without question; respect it until the day it manifest itself in a horrible massacre like the destruction of the World Trade Center, or the London or Madrid bombings. Then there is a great chorus of disownings as clerics ... line up to explain that this extremism is a perversion of the 'true' faith. But how can there be a perversion of faith, if faith, lacking objective justification, doesn't have any demonstrable standard to pervert?
-- Richard Dawkins, The God Delusion, 2006