In the US, artbrooks, the term 'race' may only be used to refer to skin color, hair texture, and eye, nose and lip shape, but in much of the world it can be applied to groups that are defined in other ways. Racism is a behavior. I don't see the appropriateness of only using it in reference to that particular behavior as directed toward people based on the physical characteristics that I just listed. The behavior is just as heinous regardless of whom is on the receiving end of it, and we do not have any suitable words to describe that behavior when it is directed towards groups that you don't consider a race. It is perfectly appropriate to use the term when that behavior is being directed at Muslims by people who are not Muslims, and that is what I will continue to do.