Clear as can be, not any aliens but more likely Demons..
And how would one distinguish the difference? Wouldn't a demon be alien to us? For that matter, so would an angel? Now if we get specific and use the term extraterrestrial, that would also likely be alien to us as well.
The problem as I see it, is that there is 'something' there. There is evidence of some parts of our history being unexplainable, but with widely accepted theories such as the various pyramids, Gobekli Tepe, buildings at Cusco, etc. the histories of past civilization have many common themes, but with different names for the events and in some cases persons. These are interesting, because we would be hard-pressed, if not impossible to replicate them. Let alone at a time when survival was of great importance, but let's go build some really complicated buildings with very unique features that we don't understand
So the question is if the truth is made available, how does this rewrite our history, or perhaps it doesn't at all , but just fills in some gaps.
There piece is that I've always found interesting is how some will completely laugh at the idea of intelligence life from another planet, but completely grab onto the concept of a demon or angel while being able to provide zero proof of either.
Scully from the X-Files said, "The truth is out there, but so are lies.", probably sums it up best. I've seen/experienced a few things that I can't explain. So until I can, I'll just keep an open mind and continue to read and research.