Rabbis since the Middle Ages onwards have sought to prove the validity of the Torah and our belief in G-d from the story of G-d’s revelation to the whole Jewish people at Mount Sinai. As explained by Rabbi Judah Halevi in the Kuzari, the logic goes like this: If G-d had not actually appeared to all the Jewish people, then it would have been impossible for someone to write a book that would be adopted as truth by those people. Because Jews of previous generations accepted the Torah as truth and passed it down to subsequent generations, and ultimately to...