Evidentiary standards are weighted in proportion to the claim being presented. Mundane claims require mundane evidence, fantastic claims require greater evidence.
Personal experience generally falls into the mundane category, even when expressed in fantastic terms. I.e. "I ate the best pizza in the world yesterday!" It is understood that I have not eaten all pizza in the world, I'm not making a fantastic claim.
If I add some form of supernature such as God to the claim, I've moved closer to fantastic. "God brought me the best pizza in the world yesterday!"
Not all religious claims are fantastic. "My life is better since I found...(insert deity.)" If that claim is modified to include ontological "truths" and instructions, the evidentiary requirements (obviously) change.
A primary issue with fantastic experiential religious claims is that the purported communications and/or experiences are often easily mimicked by things such as drugs, neurodegenerative disease, chemical imbalance, etc. While that does not entail that the claims are false, it allows for significant skepticism when analyzing the causal ancestry of any given event.