The Source is a novel by James A. Michener. It is actually a fun novel to read if you have any interest in the history of the middle east.
One of the themes in the novel is the relationship between god and humans. In the earlier part of the history described in this book, god has an intimate relationship with humans, and often manifests as a burning bush in order to speak with specific humans that god might be interested in. But over time the humans get less interesting and god gets into other things, and the whole burning bush thing becomes less and less frequent and eventually, there are no more burning bushes and there is no other contact with god. What is left behind is a belief in god but god is pretty much out of the picture.
Now, we have a new documentary on line that re-explains this model for the god-human interaction thing in modern philosophical terms. Grrrrrrrl Scccccienist has it posted on her blog, here. Please go have a look. You will love it.
Go look at that, then come back and watch this other very insightful video: