Belief systems are part of the anthropologist’s triad – culture, language, myth (belief). These three are so intertwined I can’t imagine studying one without drawing deeply of the others. Our personal library contains ~300 books on different belief/faith/mythological/folkoric systems. If you count ebooks, the number goes over 1,000 volumes (and note my bias there).
But what about using belief/faith/mythological/folkoric systems as part of your world-building?
Margaret Atwood postulates a radical cultural change brought on by an exaggerated belief system in The Handmaid’s Tale, and that culture’s language evolves to sustain the belief system. Probably the best known blend of culture, language, and belief system is in Tolkien’s Trilogy. Brian Aldiss’ Helliconia series does an excellent job of blending these elements, but it’s all predicated on Helliconia’s weather (and perhaps you’ll appreciate how intertwined everything is when one builds a world from scratch).
But again and to me, it comes down to “create a mythology only if such is necessary to move the story forward or is integral to the plot.”
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