What was the purpose of multiple species in the grand plan?

In a previous post there was some discussion on whether Neanderthals had a soul. I think the conclusion was that there is no such entity. So the next question is just what was the purpose of having multiple species on this earth? Homo Erectus, Homo Sapien, Neanderthal. They all lived on the earth at the same time, and many other species preceded them. Were they all just part of a greater human experiment where God sat back to see which would become the ultimate survivor? Well, the Homo Sapien's won that battle around 25,000 years ago. Why did it then take another 19,000 years for the Creatrix to reveal the eternal plan to Adam and Eve?
(Bare in mind I don't believe the OT creation story.)

And, if we have no soul, what happens to us after we die? If we are tucked away in the memory of the Creatrix, is there a plan to bring us back out? In different circumstances maybe to see how we would react?

The Mind of God

I have recently been introduced to an entirely new concept of heaven and earth...at least new to me. What if the sole purpose of our existence is to produce data for God's memory bank? This would make us eternal beings as long as the memory doesn't get flushed. I suppose that is reserved for bad memories (those produced by sinners). Of course I know little of this concept and wonder if there is anyone out there that can provide more information. :)

For instance, if the universe is the mind of God, then we really don't know if we are being written to memory or being read from memory, do we? Have we already lived and are simply being recalled or is this life the initial run? Could this have anything to do with deja vu?