That depends on what you call integration. Muslims are actually more inclined to learn our language and value education. I would guess there aren't all that many Muslims sitting around in the welfare offices --- notice social workers passing out the benefits are required to speak Spanish --- not Arabic or Persian.
I think a lot of the Muslims that make it over here are from the more educated classes, and the percentage of them here is still far less than in Europe so they have more pressure and education allowing them to become better citizens.
It is a shorter and less costly trip for Muslims to make it to Europe and they make up high percentages now in European countries. It is a shorter and less costly trip for Mexicans to make it to America and therefore those with less education and financial resources can make it here in higher numbers, and they make up a large percentage of our population now putting less and less pressure on them to integrate.
4 out of the 5 top rated TV shows in L.A. this last week were in Spanish.
That same problem is more and more true in Europe, but their unintegrated culture has an entirely different religious tradition and a widely divergent set of cultural beliefs than does our Latino population.