>>692545
If by Hellenic religion you mean paganism (it's not, the Hellenic religion is Orthodoxy) then i can assure you that it's definitely not growing at all. There was indeed something like a revival in 2000 till 2010 but it died overnight. In fact, the rediscovering of Orthodoxy is more on trend today. Makes sense if you consider what the country has being through.
As for the Parthenon, i too would love to see it used as a church again. It could be an alive symbol of Hellenic continuity* rather than an exibit for tourists that it is now. But for the moment i don't believe it is posible.
*Pic related: Athena's temple, the white parts, now turned in a monastery dedicated to Theotokos.