I would think it highly unlikely that there are “many Muslims” nearby, but even if there are, they can do what everybody else does in NY if there’s no church nearby, get on the subway and go to their place of worship.
However, as regards your point about an increase in Muslims, a friend who was recently in a small town near Albuquerque told me that a huge mosque was built there recently - after the town had suddenly filled up with Muslims. They were all there for awhile, did mysterious things in the giant mosque, and then suddenly they picked up and left en masse. Only a few remained to keep the mosque going.
So yes, I’d say it’s very possible that they are moving their “troops” around to establish these mosques by making it look as if there are huge numbers of Muslims. Of course, with our new Muslim-friendly immigration policy (put in place by Bambi by an administrative act the month after his inauguration) there are probably thousands of additional Muslims arriving here every week.
There is a large mosque in the north part of Phoenix. Beautiful building, just north of the 101... Every time we have been by, the parking lot has been virtually empty. Every time.