tradition

Rabbi, in the second book of the trilogy, you write that tradition is not evidence for the truth of Judaism. But I didn’t understand, there is no greater evidence than that! We have a tradition that God revealed himself to us, and brought us out of Egypt, and gave us the Torah, etc., etc. Unless you say that we don’t know if the tradition is true or if a man got up in the morning and started to transmit something and everyone who came after him transmitted the same thing, etc. But my question is, assuming that tradition is indeed reliable, do you think it can constitute evidence for the existence of God on the one hand, and the truth of Judaism on the other?