Here's my KABBetrayer take, sort of the inspiration of the Arabic males.
Lore:
After breaking out of the surface of the monsters and the humans in peace, and now betrayal route has started due to their unrespectful religious and sinnerful actions, Sans watched it over and over again, due to his failed attempts, KARMA flows into his veins due to his religious beliefs, and he decided to be Muslim/Islam instead of Christian, the skeleton will prays due to his condition to respect by Allah, after the human arrives into this massacre before Sans is ready to save the world without the human to bring happiness of joy.
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