What is the author's style in The World's Religions by Huston Smith?

The World's Religions is composed of ten chapters of varying lengths, depending upon the scope of the religion it addresses. For example, the chapter on Hinduism is by far the longest because of the complexities of the religion itself. Each chapter is divided into topic sub-headings that make the reading easier to follow. Within the sub-divisions there are often enumerated paragraphs which all pertain to one general topic or area of the religious thought. The final chapter of the book appears to be a concession to the professor in Dr. Smith, a final exam