I hope I haven't muddied the waters too much.
Not at all. I find talking about the Bible in this way rather refreshing. There was a time in my life when I studied the Bible every day. I always felt that the authors were quite serious and factual, with regard to the things they wrote about. Obviously, the authors described their feelings and interpretations of events from their own vantage point, which was marked by religious fervour.
Also, we need to remember that 2000 years ago, little was known about the world, in general. Science, in the way we understand it today, did not exist. There were no comprehensive geographical maps, or global communications. The world was a mystical landscape, and events were interpreted accordingly. If aliens really did land and interbreed with earthlings, it would have been extraordinarily difficult for people of this time to rationalise such events, and put them into any kind of meaningful context. Religion, quite possibly, would have been the only source of guidance, and the only credible authority.
After all, if creatures from other worlds - whether extra-dimensional or extra-planetary - suddenly appear in your world, you are faced with enormous spiritual challenges.