Although this book contains some correct information, it also contains falsehoods, and does not present these religions in a way that they would agree with themselves. If mixing truth and error is what you are trying to fight (i.e., in opposing "cults" that mix Christianity with false theology), then this is precisely what you need to avoid yourself also. Get the facts right, or better yet, direct people to learn for themselves from the source. Getting an accurate view of other faiths like Buddhism, Mormonism, or New Ageism from their opponents is about as likely as getting an accurate depiction of Jesus and the apostles from the Pharisees and Sadducees.
I would not recommend this book. This book claims to be comphrehensive and respectful but it is not. In an attempt to be humourous, the authors ridicule the non-Christian beliefs and their sense of humor is pretty lame. Also, they make a serious error in the chapter on Buddhism. In this chapter they claim that Buddhism is the main religion in Hawaii which is incorrect. I don't know where they got that misinformation from but Buddhism has never in the history of Hawaii, ever been the main religion.