The only chapter I found actually reflective or informative was chapter 6 (Buddhism). Chapter 5 (Hinduism) was especially bad, and there was no consideration beyond the "big five" despite having been written after 1960. Certainly, he could have looked at Sikh traditions or Zoroastrian traditions in context if nothing else.
Also referred back to his own earlier work to an astonishingly self-indulgent degree.