Cat's Cradle by Kurt Vonnegut

Somehow I'd never read this Vonnegut novel; it's a funny, insightful critique of religion and human foibles, describing the creation of new religion that acknowledges that all religions are untrue, but useful for keeping people happy. Combine that with the human tendency toward self-destruction, and you've got Vonnegut at his best.

Cat's Cradle at Amazon.com