'Oumuamua: An analysis of the debate regarding the first interstellar visitor
I firmly believe that we're not alone in the universe, but advanced alien civilizations capable of interstellar travel would probably look at us like we look at mold - at best, with indifference and at worst, something to remove.
But, it is fun to imagine how our belief systems would have been shaken up if scientists were able to show Oumuamua was an interstellar probe ("Rendezvous with Rama" anybody?)