Small Gods (Discworld Novels)

Brutha is the Chosen One. His god has spoken to him, admittedly while currently in the shape of a tortoise. Brutha is a simple lad. He can't read. He cant' write. He's pretty good at growing melons. And his wants are few. He wants to overthrow a huge and corrupt church, he wants to prevent a horribly holy war, he wants peace and justice and brotherly love. But most of all, what he really wants, more than anything else, is for his god to Choose Someone Else. . .