Islam talks about many other prophets God has sent to all people and that he has not left any nation without knowledge of Himself. What actually has become known of revelation by God outside of the Bible or the Qur'an? The following books I found quite fascinating.

presents Startling Evidence of the Belief in the One True God in Hundreds of Cultures Throughout the World. Snippets from this book: [1], [2], [3]

And a specific deeper look at what revelation of God exists in the Chinese tradition and culture is provided in these:

The above three can be ordered from Multi-Language Media.

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