Cofty,
In this scenario, after creating other beings in the spiritual realm, God kickstarted the universe and the laws that govern nature and then let it roll, sort of speaking. He is the creator in the sense of being at the origin of it all, eventually having direct intervention at several phases of the evolutionary process (that's my take on the creative activity described in the 'creative days' of Genesis).
In the course of millions of years of evolutionary process in this planet, a particularly successful species developed sufficient intelligence to rule over the planet. God took interest in this species, the Homo Sapiens, and both him and possibly other creatures in the spiritual realm began to interact with humans. Thus man began to realize the existence of a spiritual realm where divinities existed, and religion began. At some point, God must have decided that he wanted to give to humans the possibility to ascend to the spiritual realm, but they needed to be "prepared", in a way, to be made with a special spiritual bond towards God. This required the creation of a couple, in every way physically identical to the other Homo Sapiens, but that possessed this 'sonship' bond with God (the 'soul') that was absent from the other humans. In time, after this first couple would generate descendants and work to extend that special preserve, Eden, they would be given access to the spiritual realm by "eating the fruit from the tree of knowledge" and there live forever by "eating from the tree of life".
That other humans pre-existed outside Eden already can be deducted by Abel and Cain being farmers and shepherds (how did they learn farming and cattle breeding?) practising sacrifices in an altar (how did they come up with that idea?) and Cain's fear of being assassinated (by whom? - his parents?) after he was ousted from the vicinity of the garden of Eden after killing his brother.
Eden