God,is anything that posses a higher power than regular humans. Not to say they are real gods. You could say someone who runs an eight second 100 is a "track god". If aliens came to earth some people would call them gods. But most commonly is referring to god as an omnipotent individual who has control over everything.
I'm not arguing for he existence of aliens, I'm arguing for the reason that if something is more intelligent, then it could be considered a god to another. The Egyptians worshiped cats because they believed their beauty far outweighed their own among other reasons. The purpose of a god is to have a higher power that you can make responsible for anything, whether it be good or bad. In my opinion, only a fraction of humans actually fully worship god for his sheer self.