You'll be very unhappy to learn, then, that the number of moslems in the US in about 30 years should be around 90 million, if they keep up with their current rate of increase.
In 1970 or so, there were approximately 100K to 150K moslems in the US. Thirty years later there are now 30 times that number, or about 4 million (though you can find figures that vary from 3 million to 7 million, so I've just assumed it's in there somewhere).
That means that in 30 more years, we should see the number of about 90 million, or again 30 times what there are today.
I hope my math is wrong but I don't think so.