I'm not sure it was a teaching function as much as an establishing function. The best I could do to summarise it in a short post (the theory I mean) is that things have gone wrong on this planet with human development many times in it's history.
The bible itself talks about the Gods coming down to earth and procreating with the indiginous human stock. Other historical writings from around the world allude to the same idea.
So to correct the imbalances visitations have been made; some may have improved the local situation, others perhaps made it even worse. Either way what it suggests to me is that the local planetary system places certain requirements upon the human stock here. When it falls below standard, attempts are made to correct it.
Other evidence points to where cultures have developed in certain ways there has been a harvest. The saying 'when the pollen is ready, the bees arrive' may allude to this. The Mayan culture that apparently disappeared with no trace of ancestors being one example.
This subject interests me a great deal.
Edited by zoser, 30 November 2012 - 05:22 PM.