[dragonwriter]

> I don't agree that it's like nicknaming Muslims "Mohammeds" or "Qurans". There already exists a short word to refer to Muslims, which is Muslims.

“Muslim” and “Islam” weren't imported from Arabic into general use in English (or most other Western European languages) until after “Mohammedan(ism)” or similar constructions had been around for a long time.

> Mormon is an effective short form of "The Church of Jesus Christ of Latter Day Saints"

It's a short alternative, but it's not really a short form as it does not derive at all from the long form. (LDS is more of a short form.)