The story follows the (formerly) great god Om as he makes his not so triumphant return to the Omnians. Every so often he checks in with his followers, picks a prophet to kick it with for a week or so and goes back to smiting from on high. At least, that’s how it’s suppose to go. Om winds up in the inglorious form or a tortoise and it turns out that no one in Omnia is a true believer anymore. Well, there is one – novice named Brutha with a photographic memory that crowds out any hint of a personality in his brain. For everyone else, though, religion is now just a force of habit. Or in the case of Vorbis and his Quisition staff, an outlet for sadistic tendencies.
The books has several parallels between the Old and New Testament God from Christianity. Om was the great and terrible back in his beginning, taking a more active role in the lives of his followers, smitings and such. When he gets transformed into a tortoise, he get in touch with the mortals once again, as his our mortality is threatened by the lack of faith in the Omnians. However, the focus of the book is really lampooning religion is general. It’s no surprise that Om’s one believer left if someone that learned religion by rote and has never had one original thought of his own.