One of the ways it changes is to break the generational aspects of the belief structures.  This is precisely why fundamentalists push home schooling and charter schools....and why Trump gained even more status among his evangelical base by nominating Betsy DeVos as Education Secretary.  On the Catholic side of things, we already had our own version of Charter schools but in the main they weren't isolationist or theologically puritanical.  Which I suppose is why we now have the Newman Society to enforce the Catholic religious litmus tests. 

I'm not sure if it's the divisions are growing deeper, as they have been around forever.  It could be the walls are getting higher and the bridges fewer.