It's not that one should only believe in the plausability of what one did see, but that it's irresponsible to blindly bet on something you not only didn't see, but by principle couldn't see, and even if you saw, could not understand.
Yes, the bible's got a pretty good record of consistency.. of telling yet another supernatural myth. I don't care what you do, nor whether you say something that is erroneous (or not).
That's what humans are, causal True/False machines. What I will oppose is breach of my liberties in the name of an erroneous principle.
Preaching an irrational theoretical solution to real practical problems can't be anything else than a wild goose chase.
I've done catechism for years, while I was small. The teachers talked to us (imo anyway) like we were idiots, even when the analogies were especially transparent and honest. I did get what they were saying, but it was always apparent to me the ideas they were preaching could not have practical value (nevermind that, all things considered, we already knew almost all that stuff from our own experiences).
So Jesus was a nice guy, of mythical proportions. Ok, so I should do the same, be 'good'? But what was good? Something that made you fuzzy inside? My deskmate felt fuzzy eating earthworms. Feelings are inconsistent, anyone who's watched the 8oc news knows it by 10y.o., latest.
A teacher is grading the mathematical correctness of his students' copies. All are made of numbers, except one copy, that instead of 2+2= (number), is "2+2=(drying ball of student's snot). How does that stack up, in terms of mathematical accuracy? It's not a mathematical answer.
Reason and irrationality had both nice fruits to offer, e.g. various and sundry sciences for one, and arts for the other, but they were apples and oranges.
Reason was, and still is, the only failsafe method.
Suppose we made a watch, and in the usual clockwork essential to telling time on the front-end, we imbedded a chaotic singularity generator, that would affect the time displayed on said front-end.
Regardless of how accurate the rest of the clockwork would be, the time displayed would be corrupt.
The analogy here is that you're trying to rationaly define and predict something that is by principle not rational.