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.