What, until yesterday? They suddenly became diverse? The expulsion of 700,000 people from Palestine 60 years ago can't explain that.
Well, no. But the expulsion of 1,000,000 jews from Arabia at the same time, together with the constant harassment and discrimination against Christians in the post-colonialist "freed" Arab states that caused mass immigration of Christians to Europe and elsewhere, CAN explain why Arab countries today are far more monolithically Islamic than they were, say, 100 years ago.
There are millions of [non-Muslim] people, all apparently well-settled, living in intermingled communities in the Islamic world. Your statement is blatantly false.
Well, if you ignore the occassional civil war against them, as in Lebanon, or Islamist Jihad against them, as in Algeria, or nationalist government and islamist movements working together against them, as in Egypt's treatment of the Copts, or simply their genocide for being non-Muslims, as in Sudan, or...
...I could go on, but, hey, it's too easy. Sorry, CD, but to look at the Muslims world and consider it respectful of human rights takes a rather special type of blindness. You simply WANT it to be true, so as far as you're concerned, it is, and that's that.