LOL! I could talk about this crap all night.
And I think it's all connected...this globalization effort. This de-whitening of the United States...open borders.
@DCPatriot It is absolutely connected - And that de-whitening is a world wide assault on the West - They're doing it with Muslim hordes across the pond, to the very same effect. It is purposeful.
I believe at least one species is from BELOW the Earth's crust or ice at the poles. And that they've been here long before the Pyramids.
Maybe "those" are the Demons of which you speak. 
Well, from an historical POV, There is little to doubt in the idea of an underworld... It is a matter of fact if one relies on history, which I do. I do not believe that our forefathers were so stupid as to be plagued by useless superstitions - In fact, I would level that accusation on modern Man instead.
And even in the Protestant Bible, with no reliance otherwise (just the 66 books) the reality of other beings is made very clear - One merely has to step past the King Jimmy translation's known faults and the Roman church's tendency toward allegories since Augustine (ish)... And what the Book says about otherworldly and underworldly beings is really quite plain.
Lay that template upon the surface of a comparative religion and mythology soup, and a surprising economy becomes quite clear.
A good primer on kinda where I am at on all this can be found in Gary Wayne's magnificent tome 'The Genesis 6 Conspiracy' - An eight hundred page, merciless historical trip - fully annotated - into incredible bloodlines that run within and without the history of Man. He too tends to allegorize, which is his fault ... I see what he sees, but I see it as real. Literal.
Tie that with the work of Michael Heiser and to some degree Derek Gilbert (a student of Heiser with a wee difference in angle), And you will be seeing things from something close to my perspective.
It's all there, right in the Bible. And when it bears its fruit, Man will be confounded.
You and I would have a grand old time on the porch over some beers. Except in the argument of the mystic - which it turns out is the true reality. A demand to impose the underworld and its beings upon reality is really quite the other way around.