Who can really know? 'Religious fantasy' is about as good as 'scientific observation' when it comes to sorting this out - there are still too many mysteries even with as much as we know about the influences of environment, natural selection, chemical processes and the differentiation and specialization of cells and organs. It is hard to imagine our brains evolving from those of fish - but it likely did not do so. It is more likely that both 'evolved' from something in common. How they evolved is the great mystery - we don't have a well connected fossil record that shows a neat and orderly progression. 'Religious fantasy' is one thing, pondering the astonishing architecture of all that we can observe is quite another. Given the nature of the universe, are we and all we can see simply the inevitable 'accident' that would froth up out of the stuff around us, or did 'someone' have something in mind? Something to ponder although offensive to those who always want 'proof'. Trouble is, we can 'prove' so very little about any of it, only reject that which is proven false. Great question!