Discworld 13: Small Gods

'You should do things because they're right. Not because gods say so. They might say something different another time.'
Religion is a competitive business in the Discworld. Everyone has their own opinion and their own gods, of every shape and size - all fighting for faith, followers, and a place at the top.
So when the great god Om accidentally manifests himself as a lowly tortoise, stripped of all divine power, it's clear he's become less important than he realised.
In such instances, you need an acolyte and fast. Enter Brutha, the Chosen One - or at least the only One available. He wants peace, justice and love - but that's hard to achieve in a world where religion means power, and corruption reigns supreme.

The Discworld novels can be read in any order but Small Gods is standalone.