Review entries in Wikipedia and the Encyclopedia of Religion (above).
Look in the footnotes and references for authoritative, academically-oriented sources. Remember that some sources will be available in full text only through the UO Libraries as they are not "free web" sources. Some sources in the UO Libraries may be only available in print.
You can get your print books in 3 easy ways - https://library.uoregon.edu/pickup-delivery-remote-teaching