I'm entertained when Catholics accuse others of Gnosticism.
Americanism, Then and Now: Our Pet Heresy (encyclical of Pope Leo XIII)
Heresies then and now: ancient Christian heresies practiced in modern times
The Plain Truth About The Baptist Bride Heresy
Balthasar, Hell, and Heresy: An Exchange (is it compatable with the Catholic faith?)
Heresies then and now: ancient Christian heresies practiced in modern times
The Rev. John Piper: an interesting look at "heresy vs. schism"
Pietism as an Ecclesiological Heresy
Arian Heresy Still Tempts, Says Cardinal Bertone (Mentions Pelagianism As Well)
Catholic Discussion] Church group stays faithful (to heresy!)
An overview of modern anti-Trinitarian heresies
Christian mavericks find affirmation in ancient heresies
Where heresy and dissent abound [Minnesota]
Gnostic Gospels - the heresy entitled "Gnosticism."
The So-Called ‘Gospel’ of Judas: Unmasking an Ancient Heresy
Benedict XVI Heresies and Errors
The Heresy of Mohammed (Chapter 4, The Great Heresies)
What does that mean? Catholics and the Orthodox are as opposite from the Gnostic heresy as one can get. Only some of the Protestant groups approach it, and even they do so only to a small degree (though one can argue that Mormons are pretty much modern Gnostics, but they aren’t even Protestants I would argue).
Why?? There is no "secret knowledge" in Catholic beliefs. Ninety-nine percent of Catholic doctrines are far more Biblically based than Protestant ones. Christ himself taught from "tradition-based" (non-written) Jewish religious sources.
One should read the Nag-Hammadi Codices (of which this is a part) to fully realize the kind of company this codex keeps. One quickly determines the lack of scriptural value.
When reading such things, the antithesis is the most valuable lesson, those things which one must suppose are happening in the society that would spawn such a work for the obvous purpose of changing attitudes within the Church. It is interesting to see the same forces working against the church so many, many years ago.
The more things change, the more they remain exactly the same.