The danger I see is this, which I think you're saying the same
  as but in a different way: Whenever a group goes "back to
  basics" (ie - to the 'fundamentals') and tries to _RECREATE_ a
  culture from scratch based on books, rather than working-with
  the existing culture and refining it gently, there's problems.
  Big problems. I look at history. Eastern Christiandom and Islam
  had their back and forths from around 800AD-1500AD. Back and
  forth but inbetween skirmishes and political grabs, they got
  along more or less, shared knowledge. They managed to co-exist
  generally, for a long time. But then a Fundy came in and said,
  "We're going back to basics and making this True Islam" and,
  well, Fall of Constantinople. I know I'm oversimplifying history
  here but generally, that's how I see it. It's one thing if
  something becomes an organic part of your culture. Real people,
  real families, real government - really trying to keep things
  running well and people generally happy enough. But somebody
  comes along and decides, "We need to start from scratch"....
  it's problems. Always problems. It's not just limited to
  religions either. I can give other examples from other movements
  as well.