Apparently, they don't teach the important books of the Enlightenment at Stanford, e.g., Paine and Voltaire, which went over this ground earlier. Nor does Harris seem to know the first thing about Judaism, a monotheistic religion with a tradition of scriptural inerrancy, which is rather thin on concepts of the after life, at least until The End of Days. In fact the Hebrew Bible doesn't mention life after death.
It seems a stretch to include the atrocities of the Nazis and the Soviets as religious, nor does he mention Rwanda. Anthropology suggests that murderousness may go back to our primate ancestors. Undoubtedly, religious fanaticism plays an important role in human suffering, but it is not the root of all human evil.
A review of the current situation vis a vis the Muslims and our unwillingness to confront their religion-based hatred and violence could be made in far fewer words. And much has been written about the sorry history of Christianity in this regard.