Catholic books on eastern thought

I’m trying to find a book for my brother Nathaniel about Catholicism, but here is the twist. He’s pretty much a relativist that believes in God. He believes in multiple truths, and different ways to find God, so I wanted to find a book that shows God of the New Testament isn’t just bound up in western thought.

Is this a list of books out there that are Catholic in nature but has a eastern twist on it? Something that explores maybe other religions in a Catholic light?

Or should I buy him a book on something completely Catholic along with the western thought?

How about Justin Belitz - successful living. He is a Fransican but runs an interfaith centre so he uses words that do not exclude people from other faiths .

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