Guerilla warfare works if the rebels represent the majority population and easily blends into the general population. Tough to conduct guerilla warfare when you are racially distinct and the minority population. Keep the violence up and France may have ethnic cleansing. Time for France to have technical military talks and advice from the Serbs.
Might end up something like in “Camp of the Saints”, also.
There are entire sections of nearly every major urban area in France that are completely dominated by muslims.
There are also many radicals among the traditional left and anarchist movements that are not arab/muslim who have been more than willing to assist the islamists in every way possible.
They can still conduct guerrilla operations as long as the government is not willing to come down indiscriminately upon the whole group that they are hiding among