Never said such a religious revolution was even likely, merely that it was important to understand that it has never happened. Because of that, it is particularly difficult for a practicing Muslim to assimilate into Western Culture. That really isn't a unique perspective of mine, but is an observation that has been voiced by both Western and Eastern scholars though with somewhat different emphasis in the East. It was an understood issue we often debated at the Walsh School back in the early nineties.
What we are seeing today is an extended laboratory test of that debate being conducted across Western Europe and parts of the US.
Throughout Europe, for every Mayor of London there are enclaves of thousands of Muslims that have become practically no go zones for law enforcement. As you note, they attend their own schools and mosques all too often led by fundamentalists who reject nearly every aspect of the culture in which they have been transplanted. Rather than assimilation, religious and cultural differences are hardening in those ghettos.
@Doubleplay offered the example of the election of a Muslim in Germany. Frankly, that election is noteworthy because its uniqueness. German friends are selling their home in the Spessart mountains because a Muslim migrant enclave of around 500 people has been established adjacent to their village with roughly the same population. They are leaving because their teenage daughters are now subject to the lewdest possible harassment from their new neighbors. Whatever that may be called, it is not assimilation. And I should add our friends are as well educated as anyone on this forum.
None of this has anything to do with racism. In fact shouting racism has become a typical refuge for those unable or unwilling to discuss the issue. The real issue is that in the name of some ill thought out progressive gesture, we are trying to integrate cultures that are fundamentally different. In fact many of those differences are dangerously antagonistic. I should hasten to again add those are hardly original thoughts, but they very much match the original observations I have made over a professional lifetime studying and interacting with the Islamic, and particularly Arab world.
As has been pointed out in this thread, assimilation takes time. I believe the West would be extremely wise to turn off the migrant faucet for a generation and let this experiment run its course. I personally think it would only be opened again at the barest trickle.