This is the book by WC Smith that has inspired me now for many years.
This book is difficult to obtain. I have two second-hand copies, one to keep for myself and one to lend out to anyone interested.
The following essay has material related to the topic, though it’s not complete, not a full exposition of what Smith was thinking of:
WC Smith – Comparative Religion (12k words)
Here is a YouTube lecture on Tillich and WC Smith:
The bit on Smith starts 3 mins in.
There is a nasty “verdict” on Smith’s world theology in the form of a photo of a drunken Obama with the cynical caption “Good luck with that plan buddy”. The photo comes up at 9:07 and fades out at 9:11, a rather inauspicious moment?
It’s also curious that Obama was chosen here. He offered hope to many people that he could heal the world, being essentially both a Muslim (by birth and early upbringing) and a Christian (by conversion) as well as being the son of a black man and a white woman. A seemingly perfect coincidentia oppositorum (or union of opposites). And really, it did not work out so well.
I am currently (November 2018) writing a booklet titled Offering a New World Theology. I will roll out the chapters as I write them and invite comments from members of PhiloSophia. I hope then to edit the booklet, using those comments, and hopefully arrive at a better and more collaborative product.
First chapter, first version: NWT-ch1-v1 (500 words)
(First and) Second chapter, first version: NWT-ch2-v1 (1400 words total)
(First, Second and) Third chapter, first version: NWT-ch3-v1 (2000 words total)
(First up to) Fourth chapter, first version: NWT-ch4-v1 (3k words by now)