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