Hi Favel
99pc of the Rangers support are Protestant and the same with Catholics/Celtic. One thing that I have noticed over the years in Scotland though is that fans of other clubs in Scotland are almost all Protestant as Catholics to a man will support Celtic.
Without doubt Rangers are the best supported club in Scotland. Despite Celtic being allegedly Irish, the vast majority of actual Irish support Man Utd, Liverpool and Arsenal in my experience. A lot of real Irish view Celtic fans as a bit of a joke.
there s no longer much of a difference in social class now but they behave like Kosovans.
most areas oft he city are mixed. Don't know much about immigrants but most Indians and English folk like Rangers.