I just.. I don’t even know what to do with this one. Look, you’re challenging theists in general yet you go after major particulars. If God exists, then he existed before a single word of scripture was written. So we could even say for the sake of argument that the whole of the Bible is completely unreliable and filled with untruths, and it would be totally irrelevant to God’s existence. So maybe retitle your Medium story “Questions that Catholics and those who believe the Bible is the inerrant Word of God” and you’ll have a more accurate challenge.
Then you go and pose questions like, “Why do you want to believe this thing that is patently implausible and not true?” And the answer is: I don’t want to believe anything that is not true! What a stupid and condescending question. “Hey gullible idiots, why do you want to believe things that you know are false?” What kind of answer do you expect? Maybe this is why you consider your questions unanswerable.
But for me not to give you some kind of answer may accidentally appear as a concession, so here’s an antidote for that: if God created everything from nothing, what is there he cannot do? If God raised Jesus from the dead, how little of a feat is it for him to temporarily allow Jonah to live inside a miraculous life-raft that just happened to take the form of a huge fish or a whale or something? Maybe God created one singular type of sea creature for just this one day in order to accomplish this miracle. We don’t need to know the particulars, because the Creator of the universe is the one behind the feat.
So why do I want to believe it? Because I’m pleased to hear a story of God’s sovereign provision to a man who had made himself God’s enemy before humbling himself; I’m glad to know that God foreknew Jonah’s repentant heart and the things Jonah would accomplish in Nineveh (to bring a nation of evil people into repentance and under God’s love). Why do you want to believe it if your doctor tells you that your cancer might be cured? Because it’s a wonderful thing if it is true.