That was brilliantly formulated with a robust sociohistorical
  perspective. Enjoyable to read. In short: "back to basics" is
  the problem when taken too far. When you "return solely to the
  text" and allow the text to rule rather than guide the culture
  that embraces it it becomes the straightjacket of law with
  equivalent force to a police state enforcing secular laws with
  minimal variance. Look back to the fall of constantniple. What
  made it fall? What was different about the guy who led the
  charge to reform? What was different about what he did once he
  gained control? What did he keep? What did he destroy? To me,
  that was the end of Islam, First Time. A new book-based religion
  emerged under the same name. Then it mellowed over the course of
  history and there was growth again. But the mellowing process
  comes to an abrupt halt when someone decides "we've strayed too
  far" and wants to strip away the culture that grew with the
  texts as an integral part of natural life, with variations and
  exceptions and a natural humanistic tendency among humans... and
  wants to "return to the text alone". Of course then you have
  problems again. Pick and choose. Same problem with Protestant
  Reformation and splintering. Pick and choose. This is, to me,
  the cause of the difference. Fundamentalist thinking. Return to
  the text and the definition within the text with no straying
  allowed. Of course it's impossible to stick to ANY text
  completely as law, because even LAW requires interpretation.
  Laws, like proverbs, are contradictory and one must choose what
  to apply and when. When the humanistic goodness (my bias) leaves
  the religious culture and is replaced with Text Only
  Fundamentalism, it's bad news.