Answer: God keeps Adam in Garden of Eden in infantile (i.e. unconscious state). It means that Adam does not know what is good or bad and continues living total symbiosis with the God. Commiting sin (eating the apple from the tree of knowledge) and being expulsed from the garden he "is born", i.e. he becomes conscious. It means he becomes aware of his existence separate of the existence of God.
Lucifer (in the garden it is embodies in the snake) is a shadowy aspect of God, his left (sinister) hand whereas the Christ is good/light aspect of God. We can say that Lucifer (trans. "the one who carries the light, i.e. the one who enlightens things, who makes them conscious) is that part of divinity which split off (not integrated).
God is unconscious which is the reason why there is still an inter-play of light and dark. God becomes increasingly conscious precisely because of this interplay. God of the Old Testament is totally unconscious of his acts (perfectly visible in the Book of Job). Christ to fulfill his destiny and task here on the Earth needs Devil/Satan....without him there would be no Christ. It is like in the case of Prometheus ...he needs his adversary, Zeus...without his there would be no stealing of fire.
Explanation: Religions are products of human psyche. Unconscious of workings of psyche, old nations personified psychic powers as gods. So the good and the evil (enormously powerful forces within human psyche were personified as gods) were usually viewed as divine forces. Like that inner conflicts of the humankind were exteriorized.
