Dawkins's point is that you don't have to believe in something that is clearly wrong, like horoscopes and Christianity, and you can choose not to make major decisions (like punishing people) over beliefs you have no evidence for and have evidence against.
The problem with the author is that he points out people believing in stupid things like shamans and gods and assumes that they must have a smart reason for it. Horoscopes and Christianity are the modern day equivalent, and there is no smart reason for the people who believe in those to do so today, so there is no reason to suppose that there used to be for their equivalents in the past.