IT TAKES A CERTAIN AMOUNT of chutzpah to write a book called God's Politics. But you have only to read a few pages of Jim Wallis's new bestseller by that name to discover that it isn't actually about the politics of an all-knowing, all-seeing, all-powerful deity at all. Instead, it's 384 pages of Jim's politics, and Jim (with a couple of notable exceptions) is a pretty average, down-the-line leftist who, by the way, believes in God.Wallis is a hot property lately on the talk-show, book-tour circuit and, more important, in Democratic party backrooms. Still smarting from their rebuff by "values...