I know what you meant. Try to define that idea outside of the context of a specific religious description of it. You can't, that was my point.
Here you go; A god: a being, usually supernatural and possessing a great amount of power over the elements of the universe, that is worshiped or held sacred/holy by followers of a religion.
I do see what you mean, however. In order for 'science*' to attempt to disprove something like this, the simplest method is to look for evidence of a deity's actions, particularly evidence of events described in a creation tale or something of that nature, which would require one to discuss a more specific idea of a god. It would be okay to discuss the Abrahamic God then, if this community finds it easier but, the discussion progress, pace and fruitfulness will likely be affected.
Not that this discussion will be able to go anywhere for a while either way, as the wave of euphoric 'thar be no gudz herp herp' waxes and wanes.