In every land, at every period, that Muslims have conquered, they have subjugated the non-Muslim population, and converted or expelled– quickly or gradually — the non-Muslims. They are at this moment finishing the job, killing or expelling or making life so unpleasant and insecure that many will leave, in Iraq and Syria, and the Christians of Lebanon have been much diminished, and had Al-Sisi not rescued them, or at least been doing the best he can, the Copts would be fleeing Egypt by the millions instead of, as now, by merely the hundreds of thousands.
The observations, with a long historical perspective, of the historian Alain Besançon, has been re-published here.
A Google translation from the French, thanks to Hugh Fitzgerald
Excerpts from an interview (2008) with Alain Besançon, Associate and PhD in history, member of the Institute, member of the Académie des Sciences Morales et Politiques.
The story is still clear: the Muslim populations are not based in the surrounding population. It is a fact, a simple fact. The 20th century saw a purgation mixed areas. For example, there were many Christians in Turkey, Egypt etc … They are all gone. There were Muslims in Greece, the Balkans … They are all gone. There were French in North Africa, they are all gone …
Historically, it never lasted long. It was always more or less peaceful, very brutal as in Spain, or as in Turkey, by the expulsion of the foreign body. (By “foreign body” I suppose he means the indigenous people, the infidels).
Text of the interview (partial seizure):
Hmmm, well, yes, if it is the kapos he is referring to. What a snake. The most antisemitic President in US history. Obama: 
