>>/49076/
It was but I don't think that is the reason for the decline in the region, I think it's more to do with an influx of Arabs and Turks into Anatolia and the Levant and pretty much everywhere really, though Muhammad(peace be upon him) was an Arab as well but it could be a literary creation or it could be that he had slighly reddish hair compared to The Arabs so they refereed to him as having red hair.
>>/49086/
>>/49088/
I think he is referring to Arabs/Moors not Europeans. There are traditions in Africa that still see the killing of such people but recently some Algerian or Tunisian woman killed a French girl for a similar reason.