In our world, people would sometimes listen to a religious authority/prophet/etc..., because they convincingly say "I have had this XYZ religious experience". You may call it naivete, or trust excess, or lack of skepticism/reason... but someone comes and says "I saw a burning bush", and 1000s of your tribespeople basically take you at your word, if you're charismatic enough. You come and say "I had a revelation", and 1000s of Anabaptists will overthrow their government and start a commune in Munster.
Now, my world I'm building is ALMOST like Earth, with one exception: due to some quirk of nature (biology, or flora, or chemicals), hallucinations are extremely common.
Everyone has experienced multiple hallucinations themselves
Everyone has a fairly sure knowledge that those ARE hallucinations when they experience them (mechanics don't matter), meaning that a normal average person will NOT experience a hallucination and mistake it for a supernatural experience or a religious revelation.
However, this is not 100% foolproof. Some rare people can experience hallucinations without knowing they are hallucinations.
People are already (and always were) evolved with this ability to know they are hallucinating. How doesn't matter.
As such, a natural inclination of any un-believer, when a believer comes to them with a tale of something supernatural, is to say "you probably just hallucinated that burning bush/revelation/seeing someone's wounds healed, and you're one of those NON-HAL-SENSER people".
They know that hallucinations are extremely common, and that some people can't tell the difference - so "hallucination" would be their first go-to explanation for any tale of the weird, supernatural and out of ordinary.
Howe would religions develop on such a world, where everyone's predisposed to believe in hallucinations over supernatural by their own experience? Would it be a world that is nearly 100% atheistic? Or specific religion types (Buddhism/Taoism?) would dominate?
For the purposes of this question, it doesn't matter if a deity exists or not; but if a deity exists, their ability to do things is such that 100% of the effect they produced can be explained away as a hallucination.
NOTE: I would prefer answers based on real research into religions and psychology. But you don't have to be limited to that.