It's not Zoat that has them worshipping Roman gods, but DC. When they can remember which pantheon they've got them worshipping.
Wrong. DC has Atanteans worship Atlantean Gods, since you know, they are neither Greek nor Roman, but their own culture older than either.
Modern Atlanteans worship an
elemental triumvirate. It was a freaking plot point when the Greek god Triton invaded Atlantis and executed the Atlantean Minister of Faith for not worshipping him as part of the temper tantrum that ended when Aquaman executed him.
Ancient Atlanteans worshipped the Weaver, Chaon, Gemimn, Tynan, and Deedra, who would be the depowered deities I mentioned living in modern day New York.
Now maybe post-flashpoint the Atlanteans worship Greek or Roman gods, I wouldn't know.
As for YJ Atlantis, sure it has plenty of nods to classical mythology- name of city states, the Trident of Neptune, but you know where the YJ writers got those elements of Atlantis? From the comics, in which Atlantis has its own deities.
You know what the YJ writers did add to Atlantis? A city state named after a Hawaiian deity ruled by a king who is named after said Hawaiian deity.
So if if the Atlanteans worship the Roman gods, it looks like that would be a surprise to the writers of Young Justice since their Atlantis has room for hawaiian shark people.
Or am I misremembering? Did an episode of YJ say they worship Roman deities? Which one, I'll refresh my memory? An issue of the tie in comic I didn't read? In which case, what number please? Or maybe word of god from the Ask Greg, in which case I'd appreciate the link.