So I realized: what if the most logical explanation as to why a concious mind exists—on any planet, is to suffer? Suffer, however, based off our more fortunate standards specifically: to suffer the—what we would consider—"pains" of things like inconvenience, discomfort, misfortune, and displeasure.
Its the incessant indulgence in these things that lead a concious mind to be completely blind to the woes of such, thus the compassion and ability to empathize that comes with the experience (or knowledge) of suffering. It's hardly just an "eye for an eye"—the inherent need for ourselves to retaliate due to being concious of ourselves—that leads the world to be blind, it's our sense organs reacting to our environment and any desire for ourselves conjured from this reaction that is the most blinding; it's this that leads to the vanities we imagine in our heads, that we end up revolving our lives around, and make most important, that leads away from the "true life" a life of selflessness has to offer: a life most lived in the present, opposed to stuck in our heads, the images of what we consider the pain of our "past" and the thirst or fear for the "future" (our sense of time being yet another consequence of consciousness—like selfishness) dominating how we feel today.
It's our sense organs reacting to the extent we've presently manipulated our environment that leads to an addiction to it, even happiness, to the point where we become convinced that it's even lifes meaning: to become as happy as possible, but when we make our highest happiness the satisfaction of our greatest desires, we're only lead to an inevitable, massive disappointment, due to all exploitation of desire only being temporary. This begs the question: out of all the desire, and vanity that's bred from it, would there by any that don't end in inevitable disappointment due to being temporary? Love—but not Disney World kind of love, no, the Gandhi, MLK, Leo Tolstoy kind: selflessness—is the only desire that not only holds the ability to potentially last as long as man does, but also doesn't lead to inevitable disappointment. Dare I say: it's what the idea of a God or creator of some kind (not any man made God, but the substance of them)—its will: selflessness, to even it's extremes like self-sacrifice, that is the only desire worth seeking. But if you're someone against the idea of a God or creator (good luck finding the will to be selfless to the extremes) then let the fact that we're the only living things that have ever existed (on this planet, as far we know) that can even begin to consider abstaining from itself for any reason at all, be enough.
It's this that would end all suffering, but not by ending it, but by normalizing it I suppose you could say; to suffer for the sake of selflessness. To take the empty, ultimately only disappointing desire of stimulating our sense organs and fulfilling our vanities—for the sake of ourselves, and replace it, with the logic and alternative perspectives and behaviors that our inherency to selflessness breeds, that comes from our inherent ability to logic and reason.
What if we're designed to not be comforted or pleasured incessantly? Just look at the rich, most upper to lower middle class, even the poorest in a nation crippled by convenience; people of fortune (in life or in wealth) in general (like me): obese or crooked in some way or another, the idea of their temporary lifestyle they've become so attached to no longer being an avenue to being comforted and pleasured, saps or corrupts their concious mind, to the point where their willing to even kill to keep it—in some cases. Could a life of abstaining from your sense organs, and teaching yourself to thirst, desire and fantasize for the least, be what ultimately leads to a life of the most?
The extent of my experience as a "pastor" was spending a couple summers leading teen bible studies and acting as peer support for the other kids my age along with some (non-problematic) grooming for one day leading a sermon. The reason I lost my faith though is because I'm queer and could not accept that I would have to go to Hell because I was made "wrong". In fact, at the time I was kicked out of church (both my uncle's mission and the "normal" church that was supporting his effort) after I tried coming out to family and my uncle hasn't spoken to me since (and that was over 20 years ago). No loving God would make someone transgender (I didn't choose it, nor would I given the chance to) and condemn them to eternal torture for doing nothing more than accepting they are who He made them to be.
God as the source of inspiration for selflessness and morality is certainly a popular position among some Christians. Please don't take this as an attempt to talk you out of your faith, but I would offer that many cultures have existed in the world who have never known a God and they have been just as selfless as those that have. The capacity for altruism and selflessness is an inherit trait of most animals. Humans may subjectively seem like the best, but even mice in a lab will go hungry to make sure a younger or injured mouse can eat. Old Elephants wander off to die alone so they won't be a burden to the herd. These sorts of selfless actions are present throughout the animal kingdom and none of those creatures "know" any god at all. (Probably. For all we know, whale song is them preaching the gospel or singing hymns.) But a God is not needed to be selfless and I would offer that selflessness for it's own sake, rather than for the hope of eternal reward or to emulate a role model, is more profound and precious.
Love (and hate) can blind someone to the truth because they might not be able to see the subject of their love as they are, but rather as what they imagine them to be in their heart. Curiosity however puts us in an open minded state because it forces you to shift how you evaluate the world around you from judging and assessing to observing and exploring. Love has lead people to do horrifyingly terrible things throughout history, take the crusades and inquisition as an example. Hundreds of thousands of lives were ended because the Christians loved their God and hated the non-believers.
The stories in the bible have many interpretations and the spiritual journey all Christians walk is best served by independent study of the text and arriving at their own conclusions. The sign of Jonah, at least the way my uncle taught it, is a sign of rebirth and renewal. Jonah spent three days in the belly of the whale only to reemerge with new found dedication to his faith. This foreshadows and predicts Jesus' three days and nights in the tomb after the crucifixion and His return, reborn as His (fully) divine self. In both cases each character leaves behind their fears, anxieties, and sorrows to become a better version of themselves. I'm not sure I see how you're arrived at the Sign of Jonah being a mandate to teach selflessness, but I also don't think there is a wrong way to interpret the book (unless you use it to justify hate or cruelty, which many have and still do).
To me the story of Jonah has always been troubling. Jonah heard a voice in his head commanding him to go to Nineveh, but instead he boarded a ship traveling in a different direction. On their journey a storm ravaged the ship, the crew blamed Jonah and decided to throw him overboard. I was raised and taught that the bible was a literal historic account (which I no longer agree with) but through that lens the story of Jonah is tragic and appalling. Hearing voices in your head is mental illness. God offers no proof of His existence because proof denies faith. However hearing the voice of God would very much be proof, which to me means anyone who claims to hear it or know anything about His plan would either be lying, trying to fit in with their peers, or mentally ill. If you assume Jonah wasn't lying or just trying to fit in, then he would have likely had something akin to schizophrenia. Being blamed for the storm and thrown to his death would be extremely traumatic for someone vulnerable like that and the story of the whale is better explained by a psychotic break triggered by the attempted murder when viewing the story this way. I take the story to be a cautionary tale about the dangers of superstition and careless action (and the importance of seeking help if you're in distress).
I very strongly disagree that nature doesn't need explaining. Science and empirical study is one of the greatest achievements of humankind and has lead to progress beyond anything those who have come before could understand. Our study and attempt to understand silicon is the reason we're even able to have this conversation. Without understanding of our world we never would have created medicine, computers, or gone to the moon. Personally I'm of the opinion that is it our duty and responsibility to know and understand the world we live in because the more we know, the more opportunities there are to experience the wonders and mysteries of the universe. If there is such a thing as a God, I'm sure they'd want us to marvel at the complexity of their creation.