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Interesting predicament, I agree with the answer above that you might face difficulties in realising a justifiably, strict religious character if you don't identify with the religion yourself at al...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/1919 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Interesting predicament, I agree with the answer above that you might face difficulties in realising a justifiably, strict religious character if you don't identify with the religion yourself at all. It will no doubt affect your writing if you yourself find the beliefs the character holds with such esteem as "arbitrary and immutable". Understanding what, in the world around us, drives people to hope/believe that there is something more than this is key. Immerse the reader with the optimism and promise of divinity and describe any deviation from this in the harshest light possible, but make the internal conflict clear as to not completely alienate the reader. Initially most non-religious readers will find your character hard to identify with but bring his humanity and flaws into contact with his pursuit of divinity; most readers will then, hopefully, begin to understand and identify with what motivates your characters choices.