In my own experience as someone who marvels at parallels and coincidence, I thought I'd chime in. Several of the other posters have mentioned that some symbolic imagery used in Revelations actually pre-dates the Bible (specifically serpent images), and it is notable that Christianity has been...
If it was true...
If there was anything to the comparison, I think we would have heard something before now. They unveiled Eberron at Gencon 2003, and I don't recall hearing anyone drawing parallels at the convention. Do you remember any Henry? :\