I go with cultural replacements here. Likely ultimately similar
to what they're all saying. Old religions are dying. Needed
replacements. Angels become aliens. Devils become aliens. UFO is
future tech chariot of fire. Alien civilization/planet becomes
Heaven. Alien apocalypse (as with all apocalypse stories,
including ones out of Science or wherever) are a rehashing of
Protestant-era obsession with Revelations apocalypse with new
demons, new Devil, new Utopian era of peace. In short, same
story, different characters. We all fall into it because it's a
part of our cultural heritage. Sometimes the ones that buy into
the story the most are those who try to reject the original
because they want THEIR version of the same story to replace it
completely. So, there ya go. My take :)