All the people complaining don't realize that their version of the myth pertains to a different kalpa. And no a kalpa isn't X million years like you think you know or you think people 1000s of years ago new. It's an entire incarnation of the universe, stay ignorant though.
The manga has been parody from the start but some folks could only tell when it got around to their religion. I guess they thought they were truly learning a lot about the Greek and Roman religions.