It won't be a majority, but it will be France, study 1930's Germany. Many European countries do not have a bi-party establishment like the U.S. The U.S. is not established as a bi-party system per our constitution, it has just evolved into this format, but, our Constitution does afford safeguards against minority rule, hence the electoral college.

In short, a minority Sharia contingent could conceivably overtake the French government, at least to my understanding as to how France is governed, but that's not my concern, my concern is the general mass unrest within a country that has nuclear capabilities in general.

Best outcome for France; Macron gets ousted and they get someone based who'll roll the heads of the corrupt as we're about to see Trump do in the U.S.