I own this book and find it fascinating, a perennial re-read.

I have to add some words of James Madison to Amos' excellent list of quotations:

"What influence in fact have ecclesiastical establishments had on Civil Society? In some instances they have been seen to erect a spiritual tyranny on the ruins of the Civil authority; in many instances they have been seen upholding the thrones of political tyranny: in no instance have they been seen the guardians of the liberties of the people."
--Memorial and Remonstrance Against Religious Assessments

You tell 'em, Jimmy! ;D