Actually, the evidence is that the critters are not demons—at least not most of them—but fallen angels.
And there’s a considerable amount of evidence from some top flight scholars.
Available here:
and
http://www.ALIENRESISTENCE.ORG.
Some . . . government experts and experiencers have asserted that SOME grays MAY be demons in bioengineered ‘bodies’ that last about a year or so.
Just remember, they also know how to use technology. ergo, they also know how to use PCs and blog.