Confessions of a Liberal Puritan

My book club recently read "An Instance of the Fingerpost" by Iain Pears. It's a historical novel set during the English Restoration, and a lot of it is about the way religious doctrine can be used either to support or destablize established authority. It's a long book and a bit of a slog in places, and I personally found much of it tough going because two of the four narrators are utterly vile characters. But it packs a wallop at the end.