Here is a link to a lengthy article entitled “Who or What is God?” written in 2001 by John Hick, a Brit who is said to be one of the most important and influential philosophers of religion of the second half of the twentieth century. The final paragraph reads:
So here is a large-scale hypothesis which constitutes a religious, as distinguished from a naturalistic, interpretation of religion. And like all such hypotheses, it presents itself for consideration and invites others who find it inadequate to offer a better hypothesis.
I’m no scholar but this article makes a lot of sense and seems to be a good starting point.
Some Discussion Topics
Some Earlier Material