"All my instincts say that we are undergoing a profound shift away from religion in the United States today."

And how could we expect it to be otherwise, when "the greatest generation," most of whom hewed to "old-fashioned" ways, were ridiculed by their children, the boomers, and the children of boomers were indoctrinated by their parents and college professors in the belief that to be a traditional Catholic or Episcopalian or Lutheran was to be racist and homophobic?  How could there NOT be a "profound shift away from religion in the United States," given the constant pummeling of the Church?  This is by design.