Professor Roland Boer, he is afaik the only non-Chinese professor of Marxism in all of China and studies marxism, Chinese socialism, and religious belief and spirituality from a marxist perspective. These are my recommendations for books, with the first one being my all time suggestion for people:

• Socialism with Chinese Characteristics: A Guide for Foreigners
• Red Theology: On the Christian Communist Tradition
• Criticism of Heaven

Most of his books are free on his website or around the internet

https://roland-theodore-boer.net/selected-publications/