The book "The Christian Faith: What Blasphemy to Deny It" by author Annie Besant examines the main aspects of the Christian creed and advocates the importance of faith in life. The author examines the concept of faith, doctrines and principles that form the basis of the Christian faith, and provides arguments that the rejection of these principles can be considered blasphemy. The book reveals important aspects of faith and religion, encouraging the reader to understand more deeply the essence and importance of faith in the life of every person.