In Return of the Jedi, our heroes are taken prisoner by Ewoks -- except for C-3PO:
THREEPIO: I could be mistaken. They're using a very primitive dialect. But I do believe they think I am some sort of god.
Later on, the Ewoks plan to cook and eat our heroes:
THREEPIO: I'm rather embarrassed, General Solo, but it appears you are to be the main course at a banquet in my honor.
Luke uses the Force to lift up C-3PO and make him fly around. This makes the Ewoks afraid that C-3PO has magic powers, so they do as he says and free Luke and the others. C-3PO then tells them the story of the Rebellion, and they agree to help fight the Empire.
Did the Ewoks continue to think C-3PO was a god? Or did he explain that he was just a protocol droid?
If it's the former, then Threepio had a point: It is somewhat unethical to manipulate a Stone Age people by impersonating one of their gods, especially if you're persuading them to make war on the Galactic Empire.