The Garden of Eden is a metaphor for the Brain and the mind, The Brain has 2 hemispheres and the Kingdom of God has always been associated with the RIGHT mind or Righteousness, that is where the Sun rises within us, it is the East within us, its not a location on Earth, its a location in YOU!
Adam is the Father of your Mind, Eve is the Mother which is your Spirit, Satan is the Ego of the mind that divides your thoughts, and the union of the Mind and Spirit are your thoughts, they bare children, Cain and Able which are aspects of thoughts, Can't and Abel, The Can't side slaughtered his brother Abel over jealousy and was chased out of Eden thanks to the Ego (Satan) to dwell in the land of Nod..... which is a reference to Spiritual Sleep, to Nod off to sleep.
This is all going on in your head, that's why Christ died on Calvary which means place of the Skull, in Old Greek and Latin its called Calvaria, it means Skull Cap, what does the Skull Cap house? The Brain! The Garden!