You should'nt be so arrogant. Your perspective isnt the one and only. I'd like to know how you think we are going to adapt from physical entities to compltete spiritual entities. This can be achieved by either death or astral projection. If we originate from the astral plane and then become physical in this world and then once again when we die go to the astral plane then what would be the point in existing in a physical world when we are complete astral beings(if we were to evolve to this level)? Nothing is certain because everyone has a different perspective which is limited by our physical being (Maybe in the astral plane everything is certain but Im not sure of this)