the thing about islam compared to other religions is that islamic fundamentalism (and i mean proper everything-in-the-Quran-is-true fundamentalism, not like your average christian fundie who follows the bible to the letter when it allows them to attack homosexuals but ignores a lot of the other crazy stuff) is far more prevalent than it is in other religions, mostly due to the presence of the various islamic nations where such fundamentalism is not only normal but enforced by law.

islam as a religion is no more of a threat than christianity, provided the Quran isn't taken 100% seriously, and i think most muslims who emigrate abroad are willing to accept that. the problem is that you occasionally get one or two that stubbornly hold on to the values of their previous country, then they start preaching about jihad and such and the press catches onto it and starts spreading the idea that all muslims are a threat to the western way of life