How about we talk about Lafayette/West Lafayette? Since you're so fond of "facts" (though, to quote one of my favorite movies, "You keep using that word. I do not think it means what you think it means."), let's use those.
Not this year, but last year, I had the opportunity to spend some time with the Islamic Society of Greater Lafayette during Ramadan, as part of a seminary project. I attended some of their prayer services, shared in several iftar meals, engaged in lengthy conversations with Muslims from a variety of nations (Pakistan, Afghanistan, Saudi Arabia, and several African nations, to name a few). I was even invited to bring my wife and kids to the celebration of Eid-al-Fitr at the end of Ramadan, which was held at West Lafayette High School. So while I cannot speak for all Muslims everywhere, I have a pretty solid base from which to comment on Muslims in the local community - and, I'd guess, a great deal more experience actually talking to and interacting with Muslims than you do.
All of them were assimilated quite well. Yes, they participate in prayers five times daily as much as possible, and yes, there are certain aspects of their religious culture that are retained (particularly when it comes to gender separation and attire). But they carry themselves like Americans, enjoy being a part of America's culture, and some of them are even fairly progressive on hot-button issues. Nowhere was there any anti-American screed or hateful dialogue - not even from the guest imam who delivered a sermon at one of the meetings and who had no idea who I was or why I was there.
So there are actual facts that demonstrate the falsehood of your assertion that "Moslem immigrants do not assimilate." That is, I suppose, unless your definition of "assimilate" means to essentially surrender every bit of their religious and cultural identity when they emigrate. In which case, you'd be right - they don't. By that definition, neither do Christians or Jews or Buddhists or anyone else.
