Hi @bodhi-devotee ! This is a fairly good source, a good start, but I have some minor objections. I'll list them for everyone who's curious:
The first one is how the article neglects to mention that αί/αι is not an AY sound but an EH sound. Which is pretty odd because this has been in effect for more than two thousand years now.
Examples: Aristaios - (Aristaeus; Gr. Ἀρισταῖος, ΑΡΙΣΤΑΙΟΣ) is not pronounced ah-rees-TAY-ohs, but as ah-rees-TEH-ohs.
Daimôn is not pronounced DAY-mohn, but DEH-mon. (Same logic as the English word "Demon" which came from Greek)
Demeter is not Δημήτηρ today but Δήμητρα (THEE-meet-rah) , and it's not uncommon to find Greek people with that name, either feminine or masculine.
Moerae should not be this, but Mοίρες (MEE-rehs). Mousai should be Mouses and pronounced MOO-sehs, and Nýmphai (NEEM-fay) should be Νύμφες - NEEM-fehs. No feminine word in plural ends in -αι nowadays.
Also no one says Orphéfs for the last few centuries. It should be Oρφέας - or-FEH-ahs
Phýsis should be actually Phýsi (FEE-see)
Poseidóhn/Poseidôn is not wrong but it still has that archaic vibe. If you want to go full contemporary, try Poseidóhnas/Poseidônas (Ποσειδώνας - poh-see-DOHN-ahs)
Lastly, I would not suggest the ee-HEE-ah pronunciation for Hygeia/Yyeia/Υγεία. I would suggest ee-YEE-ah, since English has this specific γ sound (same as in "yeeeet!").
On a final note, I saw this blogger uses the word "Hellenismos" to describe the Greek ancient religion (like many other non-Greeks). That's not advisable, as Greeks have been using it for centuries to describe our nation/ethnicity. "Hellenismos" in Greek describes our people, in our land and abroad. Anyone who wants to learn more can read this comprehensive post about it.
Now, as the Greek saying goes, "opinions are like assholes: everyone's got one". So I'm going to briefly give mine.
The site says: Julian (332-364 CE) was the last Roman emperor who loved the Gods. He endeavored to rule as a philosopher-king and attempted to revive philosophy and the worship of the Gods. It was Julian who used the word Hellenismos to identify the ancient Greek religion in contrast to the new religion, Christianity. This use of the word eventually became commonplace.
My commentary: No Greek for the last thousand years or so would ever use "Hellenismos" for our ancient religion, because our reference point is the will of our people, and not the action of an emperor and a brief popularization of the term. We choose wether to give it importance or not in naming our people's ancient religion. I cannot emphasize enough how absurd is for an outsider to come and claim the name of our nation as the name of their religion because one emperor more than a thousand years ago popularized that name for a while. If we wanted to, we Greeks would have used the term for the religion.
(Besides, if I'm not mistaken, the specific Hellenismos as practiced in the days of Julian was not what the ancient Greek religion was at its height, and not what today's polytheists are practicing. But people can look this up.)
Anyway, thanks for your time, dear readers! Maybe I'll try to find or make a more comprehensive source myself someday! For now, I hope this post had been proven useful.