Listening to Mankar's final speech recently and reading some of the threads here has got me thinking about the nature of Aedra and Daedra, why the people of the Arena believe what they believe, where they go when they perish, and why necromancy and Daedra worship are such serious and ubiquitous problems.
It all boild down to this: Do you follow the mysterious gods who you cannot talk to or see, taking suggestions on how to live your life from scriptures and priests who claim to know what's right? Or do you serve the gods you can see and speak with and touch, who communicate with you directly?
Many people in our world do the former, but that's all we've got. Nirn provides some very compelling reasons to follow the Daedra, even though many of the Princes encourage their followers to do ill. The worshippers of the Nine claim that necromancy and Daedra worship are wrong. But it is only the worshippers making the claim. Daedra worshippers might have Molag Bal tell them to do any number of awful things... but it's Molag Bal telling them! That has to be both scary and motivating.
Also, we know that (at least some) dead Daedra worshippers go to their master's plane(t) when they die. I wouldn't call Mehrunes Dagon's or Sheogorath's realms "heaven" by any means, but to any given commoner it might seem like a better option than being reincarnated and recycled. I don't think we have any hard evidence on what happens to Daedra worshippers who die again in a Daedric realm, aside from the fact that their sould can be "put to rest" just like on Nirn.
Clearly, game-wise, the Nine are real enough to leave behind blessed artifacts of their own. Or at least their worshippers are. To my knowledge, no one of the Nine has ever appeared to anyone in Tamriel, physically or audibly, in-game.
In a world where the driving force is mythopoeia, I begin to wonder if the Nine aren't an endangered species. If belief makes real, Daedra worship could be on the fast-track to becoming the dominant religion.
What do you think? Was Mankar (mostly) right? Could the Oblivion war be considered a victory for the Daedra by virtue of scaring the s*** out of every living person in Tamriel and thereby propogating more fear and more worship? With the Emporer's holy bloodline gone, is it only a matter of time before the Altmer get their wish and the Arena collapses like so much Oblivion Gate, casting us all into the chaos of non-linear time once again?