I've got a question about Greek mythology. Couldn't find any other Stack Exchange site that might include something like that except for this one. So can I get a verdict?
It depends on the nature of your question.
Based on these conversations,
- Should we exclude religious texts, and which?
- Why was this question about the Old Testament closed as off-topic?
the previous meta consensus was that we should not treat religions or religious texts as SF/F.
Though, I personally doubt that there would be too many people who might become offended by the assumption that Greek or Roman myths are SF/F. Case in point: Were there any Greek Mythology heroes born of Goddesses? has remained open and unchallenged as far as I am aware.
Even still, if we are to treat religions as non-SF/F, we must do so for all of them.
But not all religious related questions are necessarily bad.
If your question directly relates the myth to some other SF/F work, I see little to no problem. For example, Was Enoch Root right about Heracles killing a large chunk of the offspring of Ares in original myths?
To ask or answer a good question on SF/F, there need to be sources. What is your source?
If the source is clearly and deliberately fiction, then it is on-topic.
If the source is religious and not meant to be fiction, then it is off-topic.
Chronicles of Narnia (and Biblical origins and parallels): on-topic
In your case, if your primary source is ancient Greek mythology/religion, it doesn't belong on SF/F. It belongs on a site about that religion.
But if your primary source is Marvel's Herculus, ask away.
If the question concerns both, e.g. how Marvel's Herculus compares to the Greek myth, it's still okay, since it still has SF/F.
(Those last two were both about Noah...weird.)