1) Although the author convincingly proves that the Torah could not have been written sometime later in history (the Missing Hero argument), he does not do a good job proving that Moses did not write it or transmit it. However, this is implausible because the Torah states about a half dozen places such statements as "You approached and stood at the foot of the mountain. The mountain was burning with a fire reaching the heart of heaven, with darkness, cloud, and mist. Then God spoke to you out of the fire. You heard the sounds of words, but saw no image, there was only a voice. And he said to you his covenant that he commanded you to do" (Deuteronomy 4:11-13).
Note the constant use of the word "you". Had Moses made up the events, written them down, and distributed them to the people, upon reading it they would have said to him something to the effect of: "These events that you are describing never occurred! You are a fraud!" And they would have proceeded to burn the Torah. Moreover, they would have never related the event to their children as diligently as they have, since millions of parents could not be expected to collectively lie to their children about an event they had supposedly witnessed (there is no precedent of such a thing ever happening).
2) One proof against other religions, such as Christianity and Islam that the author neglects, is that they, unlike Judaism, acknowledge that one of their adherents can cease to be a member of their religion and to become a member of another religion by converting to it. Presumably if they believe this to be the case then it follows that in their conception G-d acknowledges this to be the case as well, since the beliefs of religions embody God's beliefs. Otherwise G-d has failed in ensuring that his faith has been disseminated accurately. An unlikely scenario.
However, if there is only one correct religion then all other religions are false, and therefore not acknowledged by God as religions at all. If this is so, how could God or his adherents acknowledge conversion to a religion that does not exist in their framework? God might be able to acknowledge that someone has stopped practicing God's religion or even that he has left the religion to practice no religion at all. But to convert to a nonexistent religion is impossible. Furthermore, considering that God is kind and good, would he allow one of his adherents to leave to practice a religion that God himself knows to be false? In Judaism, however, once someone is born a Jew he is never acknowledged to be "not Jewish" no matter how many religions he converts to.