Thanks. I think the New Advent Catholic Encyclopedia which was being quoted earlier was written in the early part of the 20th century as I recall. It reflects very dated scholarship.
You're very welcome! As for the New Advent Catholic Encyclopaedia: The Dominicans have the better argument!
Bart D. Ehrman writes of this Epistle:
‘Five persons are named Jude (or Judas - same Greek word) in the New Testament, the most infamous of whom, of course, is Judas Iscariot. One of the others is Jude, the son of Mary and Joseph the carpenter, one of the four brothers of Jesus mentioned in Mark 6:4. The author of this short letter is almost certainly claiming to be that particular Jude, because he identifies himself as “Jude, the brother of James.” Since most ancient people did not have last names, an author with a common name would typically identify himself (so that you would know which Jude he was) by mentioning a known relative, almost always his father. But here the author names not his father, but his brother, James. This must mean that James is the member of the family who is particularly well known.
‘And what James in the early church was especially well known? The most famous James was the head of the first church, the church in Jerusalem. This James was the brother of Jesus, mentioned throughout the New Testament, for example, by the apostle Paul on several occasions (see Gal. 1:19). If this Jude is identifying himself as the brother of that James, then he is, by implication, obviously the brother of Jesus. But it is almost certain that the historical Jude did not write this book. Its author is living during a later period in the history of the church, when the churches are already well established, and when false teachers have infiltrated them and need to be rooted out. In fact, the author speaks of “remembering the predictions of the apostles” (v. 17) as if they, the apostles, lived a long time before. In contrast to them, he is living in “the last days” that they predicted (v. 18). This is someone living after the apostolic age.
‘There is another reason for being relatively certain that Jude did not write the book (referred to earlier, in Chapter 2). Like the lower-class Galilean peasant Peter, the lower-class Galilean peasant Jude could almost certainly not write. Let alone write in Greek. Let alone compose a rhetorically effective letter evidencing detailed knowledge of ancient Jewish texts in Greek. This is an author claiming to be Jude in order to get Christians to read his book and to stand opposed to false teachers who hold a different view of the faith.
(From the book: ‘Forged; Writing in the Name of God - Why the Bible’s Authors Are Not Who We Think They Are’).