Hello, firedragon! Maybe I can help indigochild with an answer, although likely she won't agree, but anyway -- maybe it makes sense to you somewhat. (It makes sense to me, but then, I'm a believer.) It seems, unless there is a serious abnormality, we human beings have an inborn conscience, just as we are born with bones and a heart. That conscience type thing stems back to Adam and Eve. It's all very interesting as the timeline develops from that point. And then the two children, Cain and Abel, had problems. Their form of worship was not elaborate. Not too much is written about that beyond that. But before that, Adam and Eve had instructions from God. But God was pretty solid when He also told them what
not to do. That is, they were not to eat from the tree of knowledge of good and evil. It all starts there.
It was a few thousand years after that until a form of worship was enjoined upon the large population called the Israelites. It's all very interesting...