From the Pew Research Center, which reports:
In spring 2016, we asked residents of 10 European counties for their impression of how many Muslims in their country support extremist groups, such as ISIS. In most cases, the prevailing view is that “just some” or “very few” Muslims support ISIS, but in Italy, 46% say “many” or “most” do.
The same survey asked Europeans whether they viewed Muslims favorably or unfavorably. Perceptions varied across European nations: Majorities in Hungary, Italy, Poland and Greece say they view Muslims unfavorably, while negative attitudes toward Muslims are much less common in France, Germany, the United Kingdom and elsewhere in Northern and Western Europe. People who place themselves on the right side of the ideological scale are much more likely than those on the left to see Muslims negatively.