It’s interesting that every group of people, basically ever, has started a religion.
One such example of a group of people who had NOT developed religiosity I’m aware of, interestingly, also did not develop mathematics or written language, because the capacity for abstraction which form the substrate that religions grow upon is ALSO a prerequisite for speculative concepts like symbolic meaning and set theory.
I’m speaking of certain mostly out of contact tribes of humans. en.wikipedia.org/wiki/Pirahã_people
And even they, despite living with an exclusively direct observation empiricism-based worldview, are still susceptible to collective hallucination (though they don’t cultivate it into an organized system that will ever persist beyond those who directly experienced any given hallucinatory event).