Why do you fail to note, having correctly identified that anti-semitism really means being against semitic peoples, that most of Israel's neighbours are Semitic peoples who are largely Muslim. The term anti-semitism is completely wrong in that its common usage is hatred of and bias against Jewish people and the Jewish religion. Its meaning has been further eroded by its common use, mostly by right wingers, as referring to any criticism of the government of Israel and its actions!

Now Judaism is a religion which has mostly peace-loving followers but also some extremists who are not averse to taking the law into their own hands. Similarly Islam is a religion with the same characteristics but a far larger number of adherents. Religions have ideologies, sure but describing Islam as an ideology is only reasonable if you will describe Judaism and Christianity, the other Abrahamic religions, in the same way.