Question

Dear Rabbi,
I read the book eagerly, and I have to say that I found myself a rabbi in the area of thought that has been troubling me for quite a long time.
Precisely out of identifying with the entire line of argument of the book, a question came up for me.
The claim that develops throughout the book is that a person understands that a certain claim is true to the extent that he confirms it and it appears reasonable to him. One can reach reasonableness at certain levels, but there is no possibility of reaching certainty regarding any claim. This is fundamentalism.
Based on this, I ask myself whether a person really ought to live with the awareness that it is probable that the sun will rise tomorrow, probable that my children love me, probable that God watches over the Jewish people.
In my humble opinion, people do not live with such a perception, and there is something unreasonable about it.
I will try to elaborate. Newton formulated the laws of motion and the force of gravity. These laws were found to be incorrect at high energies, high speeds, and near enormous masses. But is there not certainty that a given body will obey the force of gravity as Newton formulated it under the simple conditions that prevail on Earth? Of course there is. There is no reason for a person to live with the awareness that ‘it is probable that the pen will fall onto the table.’
In the same way, there is no reason for a person to live with the perception that ‘it is probable that my children love me.’ That does not mean there is no possibility otherwise, but in any normal situation the recognition that children love their parents is beyond mere probability.
And likewise regarding faith. Above I chose divine providence over the Jewish people. The world has conducted itself since the days of the Hebrew Bible (Tanakh) in such a way that there is special providence over the Jewish people, and therefore the Jewish people succeeded in places where no nation succeeded (return to the land, revival of the language, etc.), and therefore there is certainty in this claim. If a different reality is ever revealed, that certainty will be undermined, but as long as this is how the world is conducted, there is certainty here. True, there are no proofs for this, but this is reality. When the world conducts itself differently, we will be forced to think differently, but until then there is certainty.
To sum up: although with respect to the overwhelming majority of claims about the world one can speak only of probability, is there not some space of claims regarding which there is certainty even though there is no logical proof? Is there no possibility of ‘returning’ to the definition in the Book of Principles that faith is certain knowledge that I cannot prove?
Does a person who boards an airplane on the basis of trusting the engineers who built it and science, etc., not live with certainty (or something close to certainty) in the laws of science?
I hope I managed to make myself clear