What is the author's style in The Kingdom of the Cults by Walter Martin?

The late author of this book, Dr. Walter Martin, was a Baptist minister who held to the inerrancy of Scripture. He was a teacher of Biblical Theology, Comparative Religion, and Apologetics. He was internationally known as the host of The Bible Answer Man, a popular syndicated radio call-in program heard in North America. The author gives several reasons for writing the book: to give attention to Christian missionary work among cults; to show flaws in the different cult systems; to help Christians be able to respond to cultists and present the Gospel; to show utmost care for the redemption of souls; to demonstrate the great history of the Christian faith; and to challenge others to live and testify for Christ.