You probably wouldn't pass the Life in UK Test - it requires intelligence
Definition of Racism:
Discriminating against someone for their skin colour is racist, and unfair because it's not something they can help, and has no bearing on anything to do with the qualities of that person.
A person's religion, however, is an opinion, and we do discriminate and ostracize people if their opinions are socially unacceptable. If you hated white supremacists are you a racist? No, you're not judging them on colour - you are judging them on their opinions. Islam isn't a race its a shared opinion.
The "racism" card is played when they wish to silence legitimate criticism of the more extremist views.