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Originally posted by: Jay
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Originally posted by: MeBeJedi
He certainly knows that Vader used to be a Jedi. "You, my friend, are all that's left of that ancient religion"

If Tarkin believes Vader is the last, couldn't his statement also imply that Tarkin doesn't know the Emperor is a Sith Lord?

that all depends on how you interpret the words "ancient religion" maybe Tarkin was just talking about Jedi and not force users in general. Vader was Jedi.
As far as we know, Palp was always a Sith and never a Jedi. So maybe all Tarkin was saying was that Vader was all that was left of the Jedi.