Here's a really funny paragraph by Scott Adams, the Dilbert creator, from an article on his blog. It's funny...because it's SO TRUE and SO politically incorrect.

Consider religion. I’ve made this point many times, but it is necessary context for this discussion. At most, only one religion can be “right” because religions are mutually exclusive. It can’t be true that a Christian goes to heaven while at the same time he burns in Hell (according to Muslims). It can’t be true that we only have this life, as Jews believe, if it’s true that people reincarnate. There can’t be new prophets such as Joseph Smith if Mohammed was, as Muslims believe, the last prophet. So no matter who is right about the “big picture,” if indeed anyone is right, we can all agree that at least 75% of the world would serve their souls just as well as in their current schemes if they started praying to Sponge Bob Square Pants.

From his post "How Rational Are Terrorists"