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I noticed that the Protestant and Catholic Bibles are similar but not exactly the same. The Catholic Bible contains some books that are not in the Protestant Bible, such as Maccabees. I’m not sure when the two diverged but I assume it was during the Protestant Reformation, but I could be wrong on that. . . .
Brief history of the Bible:
Israel and Judah had various texts that wrote down their oral traditions. Apparently the first such books were written about 10th Century B.C., under David or Solomon (the Yahwist texts from the first four books of the Old Testament), as well as somewhat later the prophets (Amos is the earliest written prophetic book we have, from about the 8th Century). Over time, especially during the Babylonian Captivity, in the 6th Century, these books were given final form and collected as Torah (first five books of the OT) and Prophets, plus other texts (such as the Psalms) called the Writings.
Now, all these early books were written in Hebrew or the closely related Aramaic. However, after Alexander the Great conquered the whole area (4th Century BC), Greek became a common language, and so (by tradition) the Bible was translated into Greek in Alexandria–this became the Septuagint. In the process, some additional books were added–including some chapters of Daniel, additions to the book of Esther, and the two books of Maccabees. There was no dispute over this–the canon had not yet been established.
After the Christians came along, they began accepting gentile converts, and very quickly the Greek speakers far outnumbered the few Hebrew/Aramaic-speaking Jewish Christians. Hence they adopted the Septuagint as the Old Testament, and began to add new texts, such as letters of Paul and the Gospels, to tell the story of Jesus and the Church, forming the core of the New Testament. In response to this development, the Jewish Rabbis got together and, among other things, decided to go back to a more restricted Bible–just the books written and preserved in Hebrew and Aramaic. Meanwhile, the Church also had some problems over what texts were inspired–Marcion comes to mind–and so between about A.D. 250 and 400 the books of the Bible were considered, and the canon was established.
Fast forward some 12 or so centuries, to the Protestant Reformation. The Protestants apparently wanted to get rid of some of the books they saw as “too Catholic” and one way was to point to the Jewish Bible, and take that as their Old Testament, so they did. Some put the other books and chapters into a special section, “Apocrypha”; other simply banished them from the Bible. Luther also wanted to get rid of the Letter of James, since it said that faith alone, without works, is useless, but in the end he accept it. So the result: The New Testament is the same among Orthodox, Catholics and Protestants, but the Old Testament differs by these “Deutrocanonical” books.