Dobrayah ootrah Pavel.
As you explore the origins of astral projection, it may be problematic to orient yourself in relation to Darwinian Evolution and other Earthly assumptions.
I invite you to consider this article entitled "Astral Projection: A Doorway to a New Dimension." Astral Projection: The Doorway to a New Dimension
You might also read some of the articles on PsiPog.net : Science is Evolving
The author, Jerry Gross, claims that everything that is on this earth right now comes from the astral plane. According to Gross, many human beings are focused on Earthly assumptions of life and evolution and get this backwards. They think the astral dimension was molded from Earth. The truth is, the Earth was apparently fashioned from the ideas and discoveries which originated on the astral. In order to grasp this, you need to be willing to let go of assumptions you have and open your mind to new ideas.