Our fellow “compatriot” Epiphanius; the bishop of Salamis during the 4th century AD, had much to say about Hellenism in his best-known book called the Panarion:
https://en.wikipedia.org/wiki/Epiphanius_of_Salamis
Luckily, the Panarion survived the passage of 16 centuries so today we have translations thereof in various languages, including English. See PDF link below:
https://tinyurl.com/y32cgg8f
The Panarion is essentially a list and subsequent analyses of 80 odd heretic religious sects that circulated in Epiphanius’ time and his arguments against them to warn Christians of such pitfalls.
In the book you’ll also find the revelation that “Hellenism” was one such heresy which had nothing to do with countries, borders or race, but that it was a recently formed heretic sect that had invented and commenced propagating the “12 Gods of Olympus” theory as well as incorporating other imported mythologies from Egypt and elsewhere.
In his book, Epiphanius explains the origin of Hellenism in detail and finally warns us quite strongly to be aware and avoid it. The relevant section on Hellenism starts in Chapter 18 of the PDF, or on page 61/447 on my screen resolution.
According to Epiphanius, Hellenism was not a country nor a people, but a mere heretic religious sect and even though Epiphanius’ writings are documented ancient history studied by scholars worldwide, you won’t find anyone teaching the Panarion here in Cyprus or in Greece today!
Fast forward 16 centuries and today Greeks will have you believe that “Hellenism” is the combined “Greekness” as a movement, a culture, a force, and a way of life… and even the RoC has climbed on this heretic bandwagon claiming to be a part of this “Hellenism”; the very danger their ancient bishop had prophetically warned them about some 1700 years earlier!
The Church of Cyprus goes back a very long time… established before 100AD and second only to the Armenian in age, but the Church of Greece is a very recent early-19th century establishment. This in itself is solid evidence that Cypriots had nothing to do with Greeks/Greece who were heretics believing in fantasies for most of their existence; while Christian Orthodoxy was the CONSTANT dominant religion throughout Cyprus from before Epiphanius' time even!
So there you have it people… the origins of “Hellenism” straight from the mouth of a pious Cypriot Bishop who lived some 1700 years ago and went on to become a recognized saint by various Christian denominations.