Well Indy you have to understand that Christianity is based on Astrology, unfortunately i don't have the link for that video on this computer so i will point you to search for Jordan Maxwell on Google Video.
As for "hell creatures", well they are creatures that intersect with another dimensions and they have found the way to creep into this dimension (there is a theory that Astral dimension is only a just lower frequency of this physical dimension and that there are countless dimensions, the Astral dimension is actually a gateway dimension for us to travel across the multi-dimension planes) or these are "astralogenetic"(just invented this word
) creatures that developed in astral plane and interbred in astral plane just like you have creatures in this dimension wavelength.
Just look at this space creature, you would thought that i exited from some sci-fi movie but it isn't, it is real!
UFO NASA Discovery Vibrating Spinning Worm Orb Morph - Google Video
here it is from the earth(this could be kite but the first video is shocking):
UFO - Worm Wiggle in the Sky - Giordano 2004 - Google Video