how did the muslims come into contact with china, italy and greece?
Answer on How did the muslims come into contact with china, italy and greece?
I can provide a partial reply to your question concentrating to Greece since I am not an expert on Italy and China matters.
The autochonus Muslims in the territory of Greece are mainly the Pomaks and some Roma groups.
The mass contact with Muslim people in Greece was effected during the Ottoman occupation (400 years) when a significant number of Muslims were transferred to Greece by the Ottomans thus increasing the muslim population. In the 17th and 18th centuries there were a number of Greeks who embraced the muslim faith.
The country's Muslim population decreased significantly as a result of the 1923 population exchange agreement between Greece and the new Turkish Republic, which also uprooted approximately 1.5 million Greeks from Asia Minor.
In 1923, under the terms of the Treaty of Lausanne, the Muslims living in Greece were required to immigrate to Turkey; whereas, the Christians living in Turkey were required to immigrate to Greece in an "Exchange of Populations".
The Muslims of Thrace and the Christians of Istanbul and the islands of Gokceada and Bozcaada (Imvros and Tenedos) were the only populations not exchanged.
Today there is still a Muslim minority (????????????? ??????????) which refers to an Islamic religious minority in western Thrace, a part of north-east Greece.
The fact that the Muslim minority in Greece remains while the Greeks from Istanbul and the islands of Gokceada and Bozcaada have been forced to move to Greece by the Turkish government has been noted by human rights groups and riled up nationalistic sentiment in some corners of Greek society.
Further Muslims communities which had been transferred during the Ottoman occupation and remained in Greece reside in a few of the Dodecanese islands which between 1912 and 1947 were under the occupation of italy and as such they were not subjected to the exchange of the population between Turkey and Greece in 1923.
Although I described the most significant contact of Greece with muslim populations,we must specify that Greece came in contact with muslims for the first time through Byzance Empire which lasted 1000 years. Byzance empire was extended to a large number of Arab countries thus enabling the daily contact of Greeks with muslims as well as with a variety of other religional groups.