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This is super easy, barely an inconvenience. Have a world with multiple multiple demons/devils all pretending to be a god and trying to gain power over each other by gaining followers. And they ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/47922 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/
#2: Initial revision
This is super easy, barely an inconvenience. Have a world with multiple multiple demons/devils all pretending to be a god and trying to gain power over each other by gaining followers. And they all tell lies to the humans trying to convince them that they are the true god, as their goal is to gain followers and power. So when the agent of one demon gets tempted by another demon, it can be written in exactly the way you want. Another bonus is, you are not actually offending any particularly faith. It becomes a fantasy novel about an alternate world, of demons pretending to be god for their own power and glory.