I have heard that the beliefs of the native Americans were quite varied. Some believed as you state here but there were many different belief systems across the land. I believe that there is a single thread of truth. Many folks believe that "what ever works for you is good" I believe in gaining the actual truth and believing it. After practicing that for a while it makes a difference in ones entire perspective. This single thread or line of truth is not certainly not always able to be ascertained but seeking it is a very different procedure than just manufacturing some form of "possibility" that works for people. I believe that this is what is referred to in the Bible as the "flood of dissipation". When people make up their own truth. there is a dissipation of integrity in society. We have been witnessing that in our world now for a few decades at least.