There is a new book out from David Campbell and Robert D. Putnam, "American Grace: How Religion Divides and Unites Us"
edition), a book which sums up Campbell's and Putnam's newest sociological research in the USA. You can see the website
for the book, and you can also read a USA Today article
written by David Campbell and Robert D. Putnam about the book and their research. By the way, Robert D. Putnam is already famous for a much earlier and very interesting book on social...