And always have been.
For over a thousand years, a multitude of nations, states, peoples, cultures, religions, and empires have attempted to coexist with Islam. None have succeeded. We will not be the first.
If you have a few percent of Muslims, you have what you can pretend is a major crime problem. If you have ten to thirty percent, you have a low level civil war, which intermittently becomes a high level civil war whenever you relax or show signs of weakness. If you have thirty percent, you can have a fairly tense peace, like the not-quite-war in Mindanao if you have a large well disciplined military, guards and soldiers everywhere, and regularly and routinely deploy death squads, but you cannot afford rule of law – you can have peace only by ruthlessly and unhesitatingly applying the laws of war. With a large Muslim minority you need death squads and the routine and frequent application of torture to keep the almost-peace, the not-quite-war.
France has five or ten percent Muslims, regular car burnings, Calais has been burning for some time, and the French state has no power over substantial areas that have been successfully seized by Islam.
France has taken pretend measures – checking passports at major entry points. This is security theater. Calais continues to burn, and the French authorities avert their eyes. Muslim illegal immigrants continue to flood over the borders unopposed. Rapes by Muslims are piously ignored. Preachers continue to preach terror, and while Muslim preachers preach terror, the French authorities arrest and prosecute Marine LePen and Eric Zemmour for incitement. A Muslim that gets over the border cannot be deported.
Far from France getting serious about stopping terror, it remains a criminal offense to advocate getting serious about the problem.
Under recent international law you cannot return people unless their country of origin agrees to accept them, or at least that is how international law has recently come to be interpreted. And the countries of origin never agree. Australia and Israel have been cheerfully breaking this law, and New Zealand has been furtively breaking it. Burma has been dumping Muslims into boats and telling them that if they want to live under Islam, start sailing to a Muslim country.
When France rounds up illegals and dumps them in Africa or the Middle East, then France will be beginning to get serious. But no one can imagine such a thing, let alone propose it, for to imagine such a thing is a thought crime.
France is absolutely unserious about dealing with terrorism, and to even think seriously about dealing with terrorism is a crime no Frenchman will admit to committing.
The only good Muslim is a bad Muslim. If a Muslim is not murdering innocents and raping children, he does not take his religion seriously.