If aliens exists, how does God exist? Surely enough, god didn't "create" aliens, and it's pretty safe to say, that aliens don't practice "christianity" ...so really... is there a god? A "God" ?
Who is to say there aren't any Intergalactic Popes out there, searching the universe for the blasphemous straights who sin against the duality of everything? And who is to say God didn't create Aliens who then came to our planet and were misinterpreted to be gods?
The world can be more interesting with an open mind?