Lets assume we are in an old house together at night. And suddenly we hear a glass in one of the other rooms fall to the ground and smash. Instantly I jump to the conclusion that it must have been a ghost, because we are the only ones in the house and was nowhere near the glass. Now would you agree that it is the only possible explanation for the glass breaking?
So is it rational of me to jump to such conclusion based on what we experienced?
From an objective perspective, no. If we weren't raised with associating things we can't explain with supernaturally caused phenomena, than I would say I agree, that's not a rational conclusion.
However, wouldn't you understand the logic of how you'd jump to that conclusion?
Also, this supposes that the "critic to supernatural claims" holds the criteria of truth (what he or she believes should be rational) rather than understand what's rational to the believer and where he base his conclusions on even when we disagree. Something can make sense and be beneficial even though it's not objectively rational.
The problem is to assume that the believer has some sort of mental fault because criteria of rational is based on experience and not by objective facts. I was looking up rational and it said according to reason and logic. We can find the logic and reason behind something fact or fiction. We can understand why you'd think there is a ghost even though the logical explanation does not need to have barring in whether your conclusions were fact or fiction.
Maybe it's mixing the two up. Does logic and rational need to be based on facts or can one come to a logical conclusion of whether, say, ghosts exist despite it may not be true? (Also. Many believers say they believe and have faith not knowledge-so, wouldn't even asking for factual evidence be inappropriate to someone who says to you directly their beliefs aren't based on that criteria?)