If we take a little imaginary trip back in time to the era when Homo sapiens first started to evolve into modern humans, we might see the beginnings of some concepts that are still in place today.
For instance, it is quite likely that humans invented god(s) as explanations for unexplained events in nature. Slowly as knowledge grew, those god(s) were replaced with knowledge, but not until they were firmly embedded as memes.
Most holy writ has some story about origins, and some of those stories seem to have a central theme which delineates knowledge from faith. Some are so preposterous that they have to be believed on faith alone, which until the last thousand or so years was quite acceptable, however these days, anyone who still hold that Adam and Eve partook from the tree of knowledge of good and evil is viewed as simple minded.
As mankind developed higher brain functions, which would seem to have taken several thousand to several hundred thousand years, there were likely some very diverse cultural systems going on at once, much like today, back then there were tribes and individuals who possessed a greater intelligence than their contemporaries. Things were being explained a little at a time, which would likely cause fear in those of lesser development. I don’t think it would be too much of a stretch to imagine one of the first case’s of division among human kind to be of those with more evolved brains from those of lesser development, in the specific area of origins. An explanation of why some were capable of ‘figuring things out’ while others simply accepted things without explanation could be fuel for division. As these divisions became more and more pronounced, stories would be created to account for the differing mental ability. One such might be the invention of the tree of knowledge between good and evil, or simply the division of those holding reason and those holding faith. Perhaps we haven’t come as far as we thought.
Your ideas welcome.
Remember, this is not meant to be a scientific paper, just a thought.