I’m actually more familiar with some Jewish traditions of scripture that retain all ancient Jewish writings, yet only a limited set have been adopted for liturgical and doctrinal use.
I never heard of this “gospel” before, and I don’t know what’s in it. Is your point that the “gospel” message is incomplete without this?
Perhaps the Church looked at it LONG ago and left it out for a reason, and centuries of time have not given reason to revisit that decision.
I have listened to one of Patrick Coffin’s videos on
youtube.com about the popularity of apparitions of Mary. If I’m not misrepresenting him, I think he says that such are not necessary for the faith, and I agree with him.
The rosary was around for centuries before the alleged apparitions at Fatima. The “Fatima” phenomenon seems to have concentrated or focused people on praying the rosary, but I hardly think that is the only prayer we should be saying. I happen to prefer the litanies, where there is more intellectually challenging prayer, rather than repeating prayers over and over again. But, I digress.