I think you're all forgetting that france has a constitution which protects religious freedom and that shariah law is just plain impossible in that country. It is projected that Islam will consist of 15% of europe's population in 2100; that's not enough to change most countries' constitutions to enable shariah law. Of course, that statistic assumes that muslims will continue to migrate into Europe at the current rate (chances are that it will decrease after things begin to settle down in war torn countries).
First of all no one knows what the demographic landscape will be by 2100. Heck, we do not even know what it really is today because of the ban on ethnic statistics, and a mere few decades would already introduce a great randomness. Besides we know about nothing about conversions, free or forced (strong social pressures or intimidation for those who live among Muslims, those who want to marry a Muslim man or woman, those who want to find job or a better position in Muslim-dominated enterprises, etc). When Muslims dominate a city, how long does it take before everyone converts? We have no data. And even when you are not Muslim, a Muslim-dominated city is a Muslim environment and you adopt its culture and values.
That being said I do not think France could be completely Muslim by 2100 (but maybe in its majority). However the Île-de-France (Paris' region), our main and wealthiest region, will inevitably be dominantly Muslim (unless we take a radically different path) and may be tempted by secession. Because today a third of high-schoolers in this region are Muslims, because non-Muslims are aging while those ones are young and are more fertile, and because we continue to import more Muslims every year, most of them who set up in this region. And since this region is the seat of power and medias, they will use it to spread Islam.
Finally cultural domination is not the result of mere demographic considerations. Ibn-al-Khaldun, based on his observations of assimilation of conquered countries by Muslim minorities in the 14th century, speculated that the group with the highest assabiyah (cohesion/pride) ends up assimilating the other ones. And Muslims are extremely militant while our people have been taught to be ashamed of their values, of their nation, of their history, of their domination. Muslims are going back to a radical vision of their civilization and form communities around Islam, while we destroy our nations and identities by trying to become a multiethnic liberal province of the European empire, without any cohesive mortar left to unite individuals. It is no surprise that so far Islam has been winning the civilizational war in Europe, and changing us and converting us.
A few examples: two decades ago France still had a vivid tradition of religious satire. Now it is seen as strongly offensive and politically incorrect, and it will not take long before the left supports its prohibition, probably assimilating it to hate speech. Forty percent of French people now supports this, mostly among the pro-Muslim left. This could happen in a mere few years, especially before elections as several representatives cannot be elected without Muslim votes. We have also been banning religious signs on public agents since a century, this law is now being repeatedly violated and it could be removed in just a few years. We have also started funding Mosques with public funds, which is strictly illegal, and many support organizing a regular scheme for this.
And Jews are leaving the country, running for their lives as the Muslim presence grows and radicalizes. But the political class does not give a damn, as long as Muslims are happy. The Jews are more and more voting for the far-right, can you imagine?!
