The Arabs stayed in Sicily for less than 200 years. It is said to have been a military occupation rather than a colonisation. The Arabs brought many advances, making Sicily one of the most open-minded places in Europe, where Arabs, Sicilians and Normans lived together in peace and tolerance for decades. Then, everything changed. Even though the Arabs were tolerant, when the Normans from Scandinavia took power, they began the latinisation of Sicily. The Arabs were forced to convert and, like the Moriscos in Spain, the majority fled the island. They were soon replaced by thousands of people from Northern Italy, who came to Sicily and founded entire colonies in the middle of the island. That's how, nowadays, many Sicilian towns speak a Lombard dialect.
So, some Sicilians may have traces of Arabic blood, but it may be as much as Norman or French blood. The majority of Sicilians derive from Ancient Greeks, the Carthagenians and the original Italic populations living in Sicily before the arrival of the Greeks, not mentioning the next populations who occupied and ruled over the island (Byzantines, Catalans, Austrians, Spaniards, Anjou) who clearly mixed with the locals.
For the rest, Continental Italy was never Arab. Some cities have been besieged by them for some years but nothing more.
The Italians are a mixture of the original Italic populations who came from either the Balkans or Central Europe, with the Etruscans, the Romans (consider that, when the roman citizenship was given to every member of the empire (as before it was a privilege of those who lived in the Italian peninsula), from Northern Africa to Northern Europe, everyone could come to Rome, but they could settle in every area of the empire, so this applies to France, Spain and Britain as well), the Greeks, the Byzantines, the Scandinavians from Northern Europe (Goths, Normans, Lombards), the Catalans, the Spaniards, the Austrians and the French. Furthermore, those populations were mixed as well amongst themselves.
