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"Who decides what "reality" is,"

Repeatable scientific experiments. Trying to argue objective reality doesn't exist is logically incoherent.

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And to Account39's point, or my representation of it at least: all these tribes with wildly different worldviews still agree trees have roots, fire is hot, shelter is helpful, if you jump off something you will fall, etc etc. The parts there are disagreements on are built on a mountain of shared representations of reality, and gods or politics are just tiny pieces of this world model. We tend to focus on them and fight about them, so they are important, but nonetheless they are a tiny minority of how we all understand and represent reality.
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