(Continuing from previous post)
In the other cases, the response was anger, or I was told we do not question the Prophet because that is to question Allah. In one instance, when I brought up the passages that seem to indicate that Jesus did die, which seem to contrast the interpretation of the passage that says that these certain people did not kill him (in an above post) I was very vehemently told that the Quran is holy and we do not scrutinize it because that is to challenge Allah. Allah can contradict himself and both are true and we must believe it. The person then said the Quran DOES contain contradicting passages but that does not mean it is in error, because Allah can do as he pleases. I asked what a believer is supposed to do if it says in one place one thing and in another the opposite, he said you do what Allah said first, chronologically, in the Quran.
I say all of this here because the OP question is about the authenticity of revelation. How do you know you can trust a claim that something is authentic revelation? I would say that you first define what would NOT be authentic revelation. So something obviously in error would not be authentic. Something that went against what has already been understood to be authentic would not be authentic. Something that contradicts itself would not be authentic. If the fruits of the revelation are opposed to what the source would do or say, it is not authentic. The way the Church analyzes a claim to private revelation is a great beginning. Look at the founder or proposer of the revelation, as
MysticMonist said above, and look at their life, motives, response to what was revealed.
But I would add this. Always, in every place and time of human history: it is a bad sign when someone tells you not to look too closely, not to question, or not to think or you will be punished for disobedience. When there is nothing to hide there is no desire to remain in the dark—no fear of the light. And so I would say that authentic revelation holds up under intense scrutiny, and, not as a caveat of that first idea but as an equally important and seperate aspect of revelation: authentic revelation welcomes and allows intense scrutiny!
If I couldn’t find a rational answer to a question, or was told to not pay attention to obvious idiosyncrasies, I would have trouble accepting the entity that proposed it as a source of truth. Therefore, I would be very hesitant to call the revelation true.