In my work, I deal with clients who are not always so honest. They tell me so and so (usually the Supervisor on duty) said they could have or do this and that conveniently self-serving thing. I then say, "Okay, I'll ask the Supervisor about it.", which more often then not triggers a response from the client as if I am attacking their character. Ninety-nine percent of the time the Supervisor said nothing like what was related to me. Now expand this situation to theists and other supernatural/paranormalists. We always hear from them but never from the God/ghost/alien etc. Also, there is no continuity between the experiences related by our fellow humans, such as God or whatever telling something specific to one person as well as to another person at a different time. Nor do any of these experiences ever surprise or contradict other peoples' expectations, as interactions with a real person can. Nor can one ever walk in on the God and other person having this interaction. When dealing with people's claims about an authority, get in touch with said authority to confirm or deny the related claim. If the authority cannot be reached do not transfer authority to the claimant.

The entities that are part of these claims are usually people (can do at least what an average adult human in the west can do) with immortality (or at least they are very long living) and omnipresence (or at least no where near as geospatially-limited as a human). Given that the claimed authority has those three qualities, what do they need with communication technology OR why rely on said technology in liu of said authority? The authority would make those other sources secondary and redundant if it didn't outright contradict the sources. If the authority happens to not exist, then said sources are also unnecessary.

Lastly beware of warnings about questioning the authority that mirror this catch-22 dilemma from the book, 'Catch-22', as presented on TV Tropes:

"An Italian peasant woman deals with soldiers had claimed that the actual text of Catch-22 did not have to be revealed when carrying out orders related to it, meaning that "they have a right to do anything we can't stop them from doing." (In simple terms, "We don't have to provide a citation of the rule that allows us to do this because the rule that we're claiming allows us to do this says we don't have to provide a citation of it.")"

These two components compose the "Supervisor Principle" to be followed by atheists and theists when rival theists prosthelytize, though one may as well apply it to their own religion to see if the supernatural or whatever can speak for itself.