According to this article in the Wichita Eagle, fewer Americans believe in heaven or hell, including the Christians. Lots of the article is talk about the fear of Christian truth giving way to Western culture, none of it about popular Christian piety giving way to new expressions/discoveries in Christian doctrine, or revisions of Christian theological history, which shows that either the writer is Christian but trying not to show it, or the writer has a helluvalot/heavenly load of assumptions about religious people.