The evidence for the existence of the giving of the Torah

It is customary to claim and bring evidence for the truth of the Torah from the ceremony of giving the Torah, which was attended by hundreds of thousands of people, and there is a tradition about this, and a father will not lie to his son, etc., etc. But even if we assume that the questions that claim that these are magic (which I have never received a satisfactory answer to either) and that the event did indeed occur miraculously, how do we know that the entire Torah is true and true, since the tradition is only about the giving of the Ten Commandments in front of the entire people? And even if you claim that the stories of the Bible are truly questionable and that it doesn’t matter much, then the rest of the laws of the Torah (and there are quite a few, as you know..) that you yourself have discussed on the site on countless occasions are also subject to the same doubt of distortion and invention, and how can you take things so seriously that are questionable? (And in these matters, what is questionable is assumed to be untrue, because solid evidence must be brought for God’s dialogue with humans.)