In Episode IV, Tarkin says to Vader:
The Jedi are extinct, their fire has gone out of the universe. You, my friend, are all that's left of their religion
This struck me quite a bit, because the question arises that if Vader is part of 'their religion', then surely the Emperor is also. My question is then, why did Tarkin say that Vader was all that was left of the 'religion' of the Force, when Emperor Palpantine would equally be part of that religion?