it's always subjective and relative, even if it came from god because god is somebody. it would be an objective statement to stay that "god wants x" but it'd be subjective from within god's mind, and people could choose whether or not to follow it. physics doesn't need salespeople to get others to follow its rules. you can't ignore gravity because you feel like being immoral. if god exists, the system could easily be set up the same way.
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