His themes embody the essence of religion, yet Vonnegut himself has none. In his book Cat's Cradle , Vonnegut ironically invents a religion. It is called Bokonism, named for its founder, Bokonon. To show even its futility, its humorous place in the grand scheme of things, he writes his own Book of Genesis. God then goes on to create man out of mud.
Man blinks and asks the meaning of it all.
Then God walked away. This gives a glimpse into the mind of Vonnegut. It is said that Vonnegut keeps two messages in his writings. The first is to be good. In Slaughterhouse-Five Vonnegut also uses a minor character to show the craziness of war.