>>17863538 (OP)For two reasons
1) There are no returns
Once an era passes, every "return" to that era is just a reference, it's never a genuine return to how things were. If you make a silent movie today, it won't be a silent movie. It will be a reference to the era of silent movies because we are no longer in that paradigm, we no longer view reality and media like people during silent movie era did and the movie is thus not a genuine piece of expression, but a reference. This is about the only useful thing I've ever heard from Slavoj Zizek btw.
2) They got btfo'd
Even if there was such a thing as a return, returning to Hellenic paganism would be a massive step back. Everything people criticize in Christianity - the contradictions, questionable morality, inexactness and so on - everything is even worse in Hellenic paganism. And so people gave it up. And paganism cannot be resurrected just like that, from (Christian) books and chronicles, it requires direct participation.