The cognitive science of religion is fairly new and it is an endlessly fascinating area of research. The mundane questions of religion such as "Does God exist?" (the philosophy of religion) became uninteresting to me years ago. However, that opened up the much more engaging topic, in my view, of "Why do people believe in religion (and the supernatural)?" These book go a long way in answering that and are much more rigorous than the previous (e.g. Freudian, Durkheimian, etc) attempts.