In Vonnegut's Cat's Cradle, I believe that Vonnegut compares Bokononism to Christianity. The books of Bokonon are related to the books of the Bible. In this novel the idea of Bokononism is never thoroughly defined but we gain a definition by watching Jonah convert from a Christian to a Bokononist. Bokononism is a religion based on lies.

The "Calypsos" say:

I wanted all things

To seem to make some sense,

So we all could be happy, yes,

Instead of tense.

And I made up lies

So that they fit nice,

And I made this sad world

A par-a-dise.

Bokononist are always in the right place at the right time and whatever happens is how it's meant to be. You just live life and follow wherever your path may lead you and that's the right way. Bokononism has no point! So, to say that Bokononism is "like" Christianity is untrue. Christianity has a point, either you follow the Lord and go to heaven for eternity or you go to hell. This may seem completely absurd to some people but it's my opinion, you're all entitled to your own.