For example, take this observation from Prothero's discussion of Confucianism:
Perhaps this particularly grabbed my attention because of a recent conversation with a Chinese American friend who assured me that "no one in China is religious." Maybe he was just being fully American, seeing religion only where our culture leads us to look for it. Prothero's observations of Buddhism and Daoism as well as Confucianism would suggest that might be so.
Another interesting tidbit from Prothero concerns his effort to explain the Yoruba faith (in the U.S. usually encountered as Santeria.) The dominant scholarly typology leaves little room for recognizing this African-derived tradition at all.
Prothero's aim in this book is to explore seriously how various faiths are unique -- in the hope that knowing each other better will help us get along. He's an advocate for what he calls "religious literacy." Meanwhile, we all live in a world where atheists and "perennialists" -- those who jump across religious differences too facilely, seeing only ethical similarities -- try to make peace without understanding.
He thinks his profession, scholar of comparative religion, has something to offer that shouting combatants in religious controversy aren't appreciating.
I can go with that.