Concepts of "the unknown god" (Acts 17:23) in animistic pagan theology?

I was reading *What is the Trinity* by R.C. Sproul, where he writes on page 18: > One of the most striking things that I encountered during my graduate work in the 1960s was the evidence that was emerging from the work of theological anthropologists and sociologists who were examining the religious views of various primitive tribes in the world. They were finding that while animism was outwardly prevalent in those cultures, the people frequently spoke about a god on the other side of the mountain or a god who was distantly removed from them. In other words, they had a concept of a high god who was not at the center of their daily religious practices. This god was like the unknown god of the Greeks, a god with whom they were not in contact but who nevertheless was there. This is extremely interesting. I am not very familiar with the study of anthropology. What examples of this are there around the world?