I agree with Miles:

"Even though I belong to this "group", I don't think this is 
anything to celebrate. [...] These people really aren't a 
coherent group (I have little in common with a lapsed 
Catholic, other than the fact we don't take communion)."  

I liked Alan Wolfe's Transformation of American Religion, which 
argues that the way that all American religions are actually 
practiced - even fundamentalism - reflects narcissistic elements 
of contemporary culture.  It also suggests that even among people 
who identify strongly with particular religions, there is a very 
high level of switching between denominations.  There are some 
great anecdotes too, like the fundamentalist who advises a 
doubting stockbroker that God wants him to be rich and successful. 
I liked that one :-).

But the survey does show a remarkable shift. Anyone know why?

--James