This scenario paints a somewhat darker image. An alien race or people from another world, came to Earth long before man as we know it, emerged. Now there is a new man, a smarter man. Over time, this new man grows, learns, and develops free will. Man is eventually left to fend for himself but is told that his creator, god or master will return for him one day.
Aliens come to Earth as a barren, lifeless planet and plant the seed of life, so to speak.
This scenario views Earth as not much more than a science project, while purposely keeping us in the dark as to the alien intervention. There are many more ideas floating around out there, one of my personal favorites is the one about the Virgin Mary . This idea is that Mary was indeed a virgin and that it was not by some miracle that she became pregnant, but by artificial insemination. It suggests that Mary was abducted and impregnated, much like many abduction tales of today. No doubt, this would seem outrageous to most people of a highly religious background, but as we have explored, events are often relayed to others from the perspective or mind-set of the one who originally observed the event in question.