I do not think the Catholic church determined the canon. I have said that time and time again.
“For the blessed apostle Paul himself, following the rule of his predecessor John, writes only by name to seven Churches in the following order–to the Corinthians afirst…there is a second to the Corinthians and to the Thessalonians, yet one Church is recognized as being spread over the entire world…Howbeit to Philemon one, to Titus one, and to Timothy two were put in writing…to be in honour however with the Catholic Church for the ordering of ecclesiastical discipline…one to the Laodicenes, another to the Alexandrians, both forged in Paul’s name to suit the heresy of Marcion, and several others, which cannot be received into the Catholic Church; for it is not fitting that gall be mixed with honey. The Epistle of Jude no doubt, and the couple bearing the name of John, are accepted by the Catholic Church…But of Arsinous, called also Valentinus, or of Militiades we receive nothing at all.” The fragment of Muratori (A.D. 177).
“Learn also diligently, and from the Church, what are the books of the Old Testaments, and what those of the New.” Cyril of Jerusalem, Catechetical Lectures, 4:33 (A.D. 350).
“Likewise it has been said: Now indeed we must treat of the divine Scriptures, what the universal Catholic Church accepts and what she ought to shun. The order of the Old Testament begins here: Genesis one book, Exodus one book, Leviticus one book, Numbers one book, Deuteronomy one book, Josue Nave one book, Judges one book, Ruth one book, Kings four books, Paralipomenon two books, Psalms one book, Solomon three books, Proverbs one book, Ecclesiastes one book, Canticle of Canticles one book, likewise Wisdom one book, Ecclesiasticus one book. Likewise the order of the Prophets. Isaias one book, Jeremias one book,with Ginoth, that is, with his lamentations, Ezechiel one book,Daniel one book, Osee one book, Micheas one book, Joel one book, Abdias one book, Jonas one book, Nahum one book, Habacuc one book, Sophonias one book, Aggeus one book, Zacharias one book, Malachias one book. Likewise the order of the histories. Job one book, Tobias one book, Esdras two books, Esther one book, Judith one book, Machabees two books. Likewise the order of the writings of the New and eternal Testament, which only the holy and Catholic Church supports. Of the Gospels, according to Matthew one book, according to Mark one book, according to Luke one book, according to John one book. The Epistles of Paul [the apostle] in number fourteen. To the Romans one, to the Corinthians two, to the Ephesians one, to the Thessalonians two, to the Galatians one, to the Philippians one, to the Colossians one, to Timothy two, to Titus one, to Philemon one, to the Hebrews one. Likewise the Apocalypse of John, one book. And the Acts of the Apostles one book. Likewise the canonical epistles in number seven. Of Peter the Apostle two epistles, of James the Apostle one epistle, of John the Apostle one epistle, of another John, the presbyter, two epistles, of Jude the Zealut, the Apostle one epistle.” Pope Damasus (regn. A.D. 366-384), Decree of the Council of Rome, The Canon of Scripture (A.D. 382).