It was written, at best guess, around 150AD, which means it doesn’t pass the “witness to Jesus” test.
BTW, the Protoevangelium of James is what it is called. Genesis 3:15, “I will put enmity between you and the woman and between your seed and hers…” is considered the Protoevangelium (First Gospel).
The Proto of James is actually writings that reflect Catholic traditions at the time. It is good teaching, but that doesn’t mean it was inspired. Notice that this was a Catholic tradition long before any Dogma’s were set forth on this issue of Mary’s Perpetual Virginity.
The Didache (“The Teachings of the Twelve” circa 60-90AD) is another good example of books that are good Catholic books, although they are not considered inspired works. Others would be St. Clement’s letter to the Corinthians (circa 96AD) and St. Ignatius 7 Epistles (circa 110 AD).
To your question, all of these are great books to evangelize Protestants, because they reflect the teachings of the Early Church - before Constantine ran the Church off the rails!!!