The natives of all countries had a much more holistic/connected view. Mental illness and other disease was rare.
When I speak of fragmentation it has several aspects but a central theme. In religion we see this played out through the metaphor that is advertised and clung to in especially mainstream christianity. We see a separate god from its creation. This creates a chasm that cannot be resolved once you drink the poison of this belief. The result of this inner chasm is creating an outer world that holographicall represents this fragmentation. We see massive examples of this in our world today and historically. I use the term mainstream there because there are forms of christianity that are holistic and don't suffer from views of separation and the psychological fragmentation that occurs. But then in these forms of christianity god is not some almighty creator entity but more of totality. Christ is an energetic vehicle and not reserved to one person, etc. It is just symbolism.
Have you honed up at all on esoteric christianity? I think you would like it.