This work covers the whole history of Catholicism, including the periods of Christian history prior to the present divisions into Catholic, Orthodox, and Protestant, but within the earlier periods it focuses on the "story line" that leads to Catholicism in the Roman Rite, and particularly to Roman Catholicism in the United States.

The Historical Dictionary of Catholicism, Third Edition contains a chronology, an introduction, and an extensive bibliography. The dictionary section has more than 500 cross-referenced entries on important persons and places as well as themes such as baptism, contraception, labor, church architecture, the sexual abuse crisis, Catholic history, doctrine and theology, spirituality and worship, moral and social teaching, and church structure. This book is an excellent resource for students, researchers, and anyone wanting to know more about Catholicism.