It could be that these other civilizations, if they are far more advanced intellectually than we are, would not even measure our existence as a blip on the intelligence radar. They could be so advanced that we are to them what worms are to us.
Neil deGrasse TysonCivilization just takes it as a given that the whole world was flooding. Then science came and you had geology and modern astrophysics, and time became well understood going back billions of years. So enlightened religious people, as a necessity, had to shed the magical elements of the Bible. A little known fact is that Thomas Jefferson did just that. There's something called the Jefferson Bible. It's not widely publicized because it sort of conflicts with certain people's ideas of what the founding fathers were.
Neil deGrasse TysonIf you're really successful at bullshitting, it means you're not hanging around enough people smarter than you.
Neil deGrasse TysonIf you don't question you're stuck within a pre-existing parameters of knowledge. Questions are what take you outside of those parameters.
Neil deGrasse Tyson