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

This book is written from the Christian perspective. The author makes no apologies for sharing his viewpoint. All cults are studied in light of what Christianity believes. The author tries to convey the urgency of Christians understanding and reaching out to cults with the gospel. Christians are warned to be on guard for false teachings, to be students of the Word of God, and to be able to give a biblical response when approached by a cultist.