No it isn't. Religion and other cultural characteristics are exactly what defines a race. Those are real distinctions between people, unlike the imaginary colour barriers. (Which, yeah, I got: you don't believe in. I addressed it to you, but then confusingly started directing it at the larger group almost from the start...)

Incidentally, observant Muslims share a language (Arabic), needed to properly read their holy book. Similar thing with Jews. Add to that the cultural and physical traits shared by many Muslims, and the feeling of kinship with their co-religionists, regardless of ethnic origin... If Muslims aren't a race, what is?

---Lepus Rex