But if we take the Christian god, that god defines itself as the only one. And every other concept that is told about this god within the bible must therefore be requirements for "godhood". So the three O's, and liking to smell burnt offerings and so on comes with it. (At least if you belive the bible literally).
Any other powerful beeing within chistianity cannot be a god, how powerful it now ever migh be. The plural of god is something that cannot be. Which imho makes the term "god" a pretty useless construct within christianity. So even if we met Thor or Odin we could not call them gods.
But i dont belive in the christian god, so , I would define a God as a sentient beeing that has some power(s) which cannot ever be obtained through human technology. Now or ever.
That put gods in a different slot than "very poverful beeings" and "star-trek"-aliens