Once again Good Reply.
We so often see with religions 'developing' over centuries, attitudes changing either for better OR for worse.
It's only when SOME plonkers say & feel THEIR religion has to be literally true & 100% adhered too & obeyed that we start getting serious problems.
It begins INSIDE the religion itself which is why there's no such thing as a Christian or a Muslim as a single entity name. We've got sects which as we now know within Islam re IS etc, they start to eradicate each other.
MY 'version' of religion is better-purer-cleaner-more worthy of my god than YOURS is so I can destroy you.
Nick