Religion is a tricky one.... It is mutable, but most people (a) don't change their religion in their lifetime and (b) use religion as a proxy signal for social

Religion is a tricky one.... It is mutable, but most people (a) don't change their religion in their lifetime and (b) use religion as a proxy signal for social identity, including many things that aren't mutable. In practice: I'd take the bet that a white person of Muslim faith could get around a "no Muslims" rule most of the time. "No Muslims", then, can be a proxy for "no middle-Eastern looking folks".