I completely forgot the Indian experience, so here’s some more to my pile:
DD Kosambi (polymath marxist historian): (1) Intro to study of indian history, (2) Myth and Reality
EMS - Mahatma and the Ism
KN Pannikkar - Against Lord and State
Western Hemisphere:
Du Bois - Souls of Black folk
CLR James - Black Jacobins (this one detailing the Haitian Revolution is going to be even more relevant given recent events)
Claudia Jones - End to the Neglect (this list is a good/bad example of the lack of inclusion of women - we should include more but on a quick search this is all I could find on the cross section of marxism and religion. There will be undoubtedly be way more)
Pan-africanists:
Cabral - Return to Source, and Weapon of Theory (that last title is awesome)
An absolute banger of an answer! This goes into my saved posts! Thank you very much, comrade! I always love to get educated by comrades. :)
I completely forgot the Indian experience, so here’s some more to my pile:
Western Hemisphere:
Pan-africanists: