The pantheons and philosophies have been too murked up for that to ever be clear. For instance, the imperials would never follow Auriel into battle but gladly die for Akatosh and vice-versa for the Altmer. To us they are the same, but to them they are two very different gods. The Nords are surly Shor worshipers, but are the Bretons and Imperials? And, even though they're men, the Redguards seem to vilify Shor, but again would Auriel be "Tall papa" to them? And what of the Bosmer, they are elves but seem to worship the Earth Bones and don't subscribe to the hatred of Mundus. And what of the Argonains? We know nothing about them, or the Khajitt or the Sload and how they would react in such a situation. What of the Akaviri? And what about the Dunmer and Orcs? They worship Daedra, so would they even take sides in this conflict? Both reject the worship of Auriel but also seem to vilify Shor.
Basically, its a loaded question and really can't be asked.
Okay, so what about ideologies? I only threw in Shor and Auriel as being that represent the ideology of Nirn = prison/not prison, which is more of the focus I was leaning to, not who would fight specifically for Shor or Auriel.
And this thread is for the purpose of just having some fun guessing and speculating. I realize that there is a bunch of missing information, and that's largely the point of this, too see what you think which race would view Mundus = prison or not. Perhaps I should rename the title of the thread.