Cofty I really enjoyed your summary. Haidt's methods of studying the differing moralities of groups by going to India, and also studying the WEIRD culture we all live in by studying graduate students at a Northeastern University.
He is applying his field of social psychology to religious development in our species. One of the most interesting statements that he made was that religion and spiritual experiences in particular "bind and blind us". He gives many examples not just religious ones as Cofty mentioned. Where we circle something sacred as a group. We are bound together in this exercise, blinded to its faults in the process. Then feel a sense of something greater than ourselves. Sporting events, 80's raves, military units, religious revivals, and so on.