Kurt Vonnegut's Cat's Cradle

In Cat's Cradle, the narrator haplessly stumbles across the cynical, cultish figure Bokonon, who populates his religious writings with moronic, twee aphorisms. The great joke of Bokononism is that it forces meaning on what's essentially chaos, and Bokonon himself admits that his writings are lies. If the protagonist's trip to the island nation of San Lorenzo has any cosmic purpose, it's to catalyze a massive tragedy, but the experience makes him a devout Bokononist. It's a religion for people who believe religions are absurd, and an ideal one for Vonnegut-style humanists.