Catholic and Protestant Bibles: What Differs

Set a Catholic Bible and a Protestant Bible side by side and the first impression is how much they share. The same four Gospels, the same letters of Paul, the same Psalms, the same Revelation. The differences are real — and worth understanding — but they are narrower than many people assume, and they sit almost entirely in the Old Testament.

An identical New Testament

Both traditions receive exactly the same New Testament: 27 books, from Matthew through Revelation, with not one title in dispute. Whatever edition is in your hands, the Sermon on the Mount, the letters to the Corinthians, and the accounts of the resurrection are the same books in the same order. Whole shelves of what Christians read most — the Gospels, Acts, the epistles — are common ground without an asterisk.

Where the Old Testament differs

A Catholic Old Testament contains 46 books; a Protestant Old Testament contains 39. The difference is a set of seven — Tobit, Judith, Wisdom, Sirach, Baruch, and 1 and 2 Maccabees — plus longer Greek passages of Esther and Daniel. Catholics call these the deuterocanonical books and read them as Scripture; Protestant traditions generally class them as Apocrypha, historically respected but outside the canon. The 39 books both traditions share are identical as a list: every book in the shorter Old Testament also stands in the longer one.

How the two lists came about

The early Church largely read the Old Testament in Greek, in the Septuagint, which carried the longer collection; the councils of Hippo (393) and Carthage (397) approved an Old Testament matching today's Catholic list. Rabbinic Judaism, meanwhile, settled on the Hebrew canon — the shorter list. In the sixteenth century the Reformers chose the Hebrew canon as their measure, while the Council of Trent reaffirmed the longer one in 1546. For centuries afterward, Protestant Bibles still printed the disputed books in a separate section; that section quietly disappeared from most printings in the nineteenth century. Two reasonable answers to one hard question — which ancient collection do you follow? — produced the two tables of contents.

What it means for a reader

In daily practice, the overlap dominates. A Catholic and a Protestant reading the Gospel of John are reading the same book; so with the Psalms, Isaiah, and Romans. The difference shows up at the edges: a Catholic will hear Wisdom or Sirach read at Mass and find the Maccabees in the November lectionary, while a Protestant edition simply will not contain those pages. If you want the longer list within reach, the Adorantis app follows the Catholic canon — all 73 books — for listening on an iPhone, offline when you need it. Either way, it helps to know that the sixteenth-century disagreement concerned seven books, not the Gospel.