I've said it before... the older I get, the more I lean towards Aliens-as-demons or Fallen Angels, if you will. Seems like I'm not alone.
Nick Redfern on the Djinn and Guiley's and Imbrogno's new book
Nick Redfern on Aliens and Demons...
I'm not as prolific as Redfern on the topic, so I'll just let him (and the links above) do all the talking.