I disagree with the disparagement of shamans. Take a look at this video https://www.youtube.com/watch?v=MUJmKl7QfDU

The weight bobs up and down on the spring. Then a ghost comes in from the left and pushes it to the side. The point of the video is to talk about a mechanistic, materialist explanation of this: it is an example of auto parametric resonance. But the video doesn't actually go through the mathematics. I cannot fill in the mathematical details myself. I doubt that you can do so either. So we just take it on trust that the stuff about a ghost coming in and pushing it sideways is not actually correct.

Notice that scientific knowledge is often hard won and so difficult to understand that only a few people know for themselves that it actually makes sense. Believing in a spirit world makes a lot of sense. More so in the past than the present. One might even claim that the time for believing in the spirit world has passed. But it always represented a reasonable attempt to understand the world.