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Don't worry, modern Greeks don't have an obsession with Olympian Gods ahahah... this was indeed on a series (5-10-20 drachma 1930), but only 2 of them had gods on it.

the 5 drachma didn't feature a god, but had the Phoenix (on nickel): https://steemit.com/photography/@alexgr/photography-greek-numismatics-pt1-phoenix-rising-from-its-ashes

the 10 drachma featured Goddess Demetra (on silver 0.500): http://www.ebay.com/itm/like/191991223129? - I won't be featuring that one as it's below the threshold of my aesthetics...

the 20 drachma was Poseidon (on silver 0.500) - which is pictured in this post.

Aside from these, from 1900+, you'll find Gods

a) in the 1912 - 20 lepta (Goddess athena): http://en.numista.com/catalogue/pieces2365.html

b) the 20 lepta / 50lepta / 1 drachma / 2 drachma set of 1926 with Goddess Athena: http://www.ebay.com/itm/Uncirculated-1926-Greece-Complete-Set-Drachmai-Lepta-Goddess-Athena-Head-/321395138495

c) the 1973 - 20 drachma with Goddess Athena: https://steemit.com/photography/@alexgr/photography-greek-numismatics-pt5-goddess-athena

...there might be a few more, in very limited quantities, proofs, collectibles, etc, like this: http://www.ebay.com/itm/GREECE-100-DRACHMAS-1978-SILVER-PROOF-50th-ANNIV-BANK-OF-GREECE-/390571863221?

Or this: http://en.numista.com/catalogue/pieces56315.html

...but generally, they are very few. And not always good looking. I mean the gold piece above on Zeus could be far, far better.