Covers a range of issues, figures, and topics related to apologetics. Unlike most encyclopedias, this one is the product of a single author. Geisler applies a classical apologetic, but he summarizes evidentialist and presuppositional approaches well. He covers the relationship between Christian faith and philosophy well, but the social, cultural, and imaginative aspects that have become important to contemporary apologetics are largely absent. Entries include brief bibliographies for further study.

Arranged in two parts, the first consists of six major introductory articles that cover the history of apologetics and methodological developments. The second consists of shorter entries that cover a range of topics, including important figures, philosophies, doctrines, religions, and various moral issues. Entries include bibliographies for further research.