The birthrate of Muslims in France is also converging on the mean. It's been falling since the early-1980s and now stands at 2.5 versus 2.0 (interestingly the birthrate in the Maghreb is 1.8). In the next few decades France's Muslim population will grow to be a larger minority, but nevertheless still a small one.
Increasingly Islamic traditions are being frenchified: weddings in mosques where the bride wears white, carries a bouquet and holds hands with the groom. One French academic calls this process formatage: the creation of a new sub-culture, both French and Islamic.