Yes, mostly Orthodox Jews. Italy's Jewish community is estimated at about 45,000 as of today (2014).
6 millions jews were killed
As of 2010 the current population of Jews in Italy is 28,400.
Italy enacted racial laws in 1938, eliminating civil rights for Jews. About 6000 Jews left the country to avoid this indignity, reducing the Jewish population to about 40,000 at the start of the war. Jewish refugees fleeing German occupied lands added to these numbers, so that by 1943, there were something like 44,500 Jews living in Italy. Of these, 7,680 died during the Holocaust (mostly at Auschwitz).
Italian Jews get circumcised.
This is a very broad question and it depended where you were. Jews were allowed to live in some locations, although in separate quarters. Jews who had taken Christianity only to avoid persecution in Spain and Portugal and came to Italy, were not always allowed to return to Judiasm, because practicing any faith other than Christianity was also subject to punishment. Then again, Jews were sometimes expelled from locations, such as Naples. Some were allowed to settle in northern Italy. There is a lot of material on line you can research.
7,500.
Jews - 1984 was released on: USA: February 1984 Italy: October 2003
In both cases the answer is no. However, after Italy surrendered in 1943, much of the country was occupied by the Nazis and they deported Italian Jews to Auschwitz. The Japanese, who were almost entirely unfamiliar with the long-standing "Christian" tradition of antisemitism found the Nazi attitude towards the Jews very puzzling.
Does Italy have any islands
The answer is no. Although Italy introduced some antisemitic laws in 1938, the country did not kill Jews.
For the same reason why this happened later in other countries including France and England. Anti-Semitism; hatred of Jews.
No, Gentiles are any non-Jews.