Doctorwhovian
Fleet Captain
Emperor Palpatine of course was a Sith lord, and even though his nature as a Sith was not revealed until TPM (Previously-going mostly by the movies-Vader was the only known Sith lord), his nature as a Dark side user of some sort was established in ESB and ROTJ.
Of course in the first Star Wars, Vader is considered the only remnant of the Jedi's religion by Tarkin, and of course he's mocked by Admiral Motti. The concept of the Emperor probably hadn't been fleshed out at this point-he's mentioned of course but the novel and some other source material paints him as sort of a weak-willed ruler (Sort of like TPM's Valorum). In ESB and ROTJ, Vader's orders are still questioned at times, but the Imperial officers seem to have a fear of him all the same.
It's also sort of implied a bit that the general populace of the Republic isn't really aware of Palpatine's "religion" anyway, although he's quite open about it when talking with Vader in his arrival scene in ROTJ. He of course keeps his dual identity secret from both the Republic and the Seperatists/Trade Federation (Although there's a bit of weird continuity in which the Viceroy in AOTC, according to Dooku, felt betrayed by Sidious...and yet he's taking orders from him in ROTS).
Of course in the first Star Wars, Vader is considered the only remnant of the Jedi's religion by Tarkin, and of course he's mocked by Admiral Motti. The concept of the Emperor probably hadn't been fleshed out at this point-he's mentioned of course but the novel and some other source material paints him as sort of a weak-willed ruler (Sort of like TPM's Valorum). In ESB and ROTJ, Vader's orders are still questioned at times, but the Imperial officers seem to have a fear of him all the same.
It's also sort of implied a bit that the general populace of the Republic isn't really aware of Palpatine's "religion" anyway, although he's quite open about it when talking with Vader in his arrival scene in ROTJ. He of course keeps his dual identity secret from both the Republic and the Seperatists/Trade Federation (Although there's a bit of weird continuity in which the Viceroy in AOTC, according to Dooku, felt betrayed by Sidious...and yet he's taking orders from him in ROTS).