Listen: Billy Pilgrim has come unstuck in time.
Among the things Billy Pilgrim could not change were the past, the present, and the future.
On Tralfamadore, says Billy Pilgrim, there isn't much interest in Jesus Christ. The Earthling figure who is most engaging to the Tralfamadorian mind, he says, is Charles Darwin - who taught that those who die are meant to die, that corpses are improvements. So it goes.