Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Knowledge of How a Cult Draws in New Members

I guess what you consider real "truth" and true "knowledge" will decide whether this book is useful. This used to be the most popular books for the Jehovah's Witnesses to indoctrinate newcomers in their cult (now replaced with "What Does the Bible Really Teach"?). Nothing in here is to believed, as the Watchtower Society is well known to lie, quote secular sources out of context, and using their funny translations of Greek and Hebrew among other things to convince the nave that the only right way is the Watchtower way. There is nothing good to be said about these books.