This would be true if the canonical acceptance of the canonical nature of the book was a merely local thing, but it’s not true. Do you have any evidence that their canonicity wasn’t widely accepted?
John Barton — The Oxford Bible Commentary (2010), in his “Introduction to the Old Testament”, Barton writes: “the early Christian church, which was predominantly Greek-speaking, tended to accept this wider canon of books.”
Barton also says that che some fathers, like Melitone and Jerome, proposed to exclude the deutero canonical books, but said proposal was not accepted.
Not accepted by whom?
Also, I think there is a big problem with your wider argument, because although you correctly distinguish historical acceptance from divine inspiration, you assume that the Hebrew canon must be the authoritative standard for Christianity without establishing why.
I agree that a book doesn’t automatically become inspired merely because it appears in a Greek biblical manuscript, but the reverse is equally true: a book doesn’t automatically become uninspired simply because it is absent from the Jewish biblical canon.
1. You are assuming precisely what needs to be demonstrated.
What historical evidence establishes that the Christian Church was obligated to adopt the boundaries of the Hebrew canon rather than recognize its Scriptures through its own received tradition?
The existence of a Jewish canonical tradition doesn’t, by itself, establish its exclusive authority over Christian Scripture.
In fact, biblical scholar Edmon L. Gallagher explains in The Apocrypha through History (Oxford University Press, 2025) that we lack firm evidence of a closed Jewish biblical canon at the beginning of Christianity.
2. Augustine did not simply assume that every book found in the Septuagint was inspired.
Read for example De doctrina christiana, Book II, chapter 8.
Augustine explicitly proposes evaluating canonical books according to their reception among the Catholic churches, giving particular importance to churches of apostolic significance.
That is quite different from saying that he mistakenly canonized books merely because they appeared in the Septuagint.
Furthermore, the inclusion of the two books of Maccabees is explicitly attested by the African councils and by Pope Innocent I in his letter to Exsuperius in AD 405.
These are concrete ecclesiastical judgments, not simply an accidental consequence of using a Greek translation.
3. The Septuagint itself was not a single, universally fixed collection of books.
Therefore, the suggestion that Christians automatically granted canonical authority to everything included in “the Septuagint” oversimplifies the historical situation.
4. Christian belief concerning prayers for the dead was not dependent solely on Augustine or the canonical status of 2 Maccabees.
Tertullian already witnesses to offerings for the dead in the early third century.
Even more significantly, Cyril of Jerusalem teaches the spiritual benefit of Eucharistic prayers for the departed, despite omitting Maccabees from his own canonical list.
This demonstrates that the underlying Christian practice cannot simply be dismissed as Augustine’s misunderstanding of the Septuagint.
5. Calling the wider canon an “error” is not a historical argument.
You acknowledge that this is a matter of opinion. But if you want to establish that the Christian reception of 2 Maccabees was mistaken, you need to provide a positive argument for why the Hebrew canon should be exclusively authoritative for Christians.
You cannot simply assume that conclusion and then characterize the contrary Christian tradition as an error.
So my question is very simple: what evidence from the apostles or the first-century Christian Church establishes that the Hebrew canonical boundaries were binding on Christians and that 2 Maccabees had to be excluded?
Until that question is answered, appealing to the Hebrew canon does not refute the legitimacy of the Church’s wider canonical tradition.