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Show, don't tell. If the religion is that important to the character, then it will be apparent in almost every aspect of the person's life. Physically: Clothing: men and women (and don't forget...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/1906 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/1906 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Show, don't tell. If the religion is that important to the character, then it will be apparent in almost every aspect of the person's life. Physically: - Clothing: men and women (and don't forget the Mormon "garment") - Hat/turban/skullcap/scarf/veil - Hair: length (that is, when is it allowed to be cut), style, hidden under a wig, hidden under veil - Face: for men, beards/no beards; for women: how much can be shown Food taboos: - Various animals are or are not allowed - Mixing meat and dairy (I know one Jewish woman who couldn't be bothered to figure out meat vs. dairy so she always ate vegetarian for lunch at work) Behavior: - Resting on the sabbath (Orthodox Jews can take this to staggering lengths. "Not operating machinery" can be parsed to "turning a doorknob is okay, turning a deadbolt is not.") - Attending services - Some people attend services daily, not just weekly - Crossing oneself when passing a church - Tithing - How does the person swear? - How does the person speak? (I've known fundamentalists who, without exaggeration, manage to work the name of Jesus into every third sentence.) House décor: - Pictures of saints/popes/Jesus/Mary etc. on the walls - Crucifix/Mezzuzah/Buddha ...You get the idea. Once you've established that this is A Religious Person, and if you write about the varying rituals from a kind perspective rather than a mocking one, your reader will grasp the importance of the religion to the character, and will understand why s/he does whatever it is you're trying to do.