I must say, I commend your work and idea.
I've been considering a similar idea as, originally a thought to the next civ, now a sort of foundation for a mod, where mythology, magic and technology are all interwoven into the game. Most for my ideas are essentially from Age of Wonders and mythologies of the different nations, as well as setting up sacrifice, mana and spell research systems and create new techs and update the old ones to fit the mod. I plan to download the mod so as to get some more ideas.
Firstly, perhaps a better name for the Atlantis wonder may be "the Posidean Citadel", or something to that nature.
Also, I noticed you added Atrus, from Myst I presume, as an Artist, would you consider going as far as to add Yeesha as a Great Prophet? During the Uru games, I don't know where, Yeesha sets off to the Cleft and finds Calam, who after Atrus helps her further in the Art. She initially thought Calam was 'the Grower', one who would restore the D'ni, but Calam was murdered and in turn she destroyed him. After that point and learning more of the potential of the Art, she began to see herself as the Grower, thus becoming a prophet.
One final idea I have, originally designed by me, may be a bit too powerful, but I want to see some feedback all the same. My idea runs along the lines of; each mythology appear to have certain qualities that tend to define the path of nations and even give them additional character, so therefore I figure that perhaps adding special Belief modifiers can be added to each civ. Beliefs in this context are similar to Civics, they modify some civilization outputs, be it production, Culture, GP points, and their effects are throughout the nation. Beliefs also have one special wonder for each, be it the Statue of Zeus (Greek), the Pyramids (Egyptian), or the United Federation of Planets (Pop Culture, debating PC Wonder). I'm still working out a few of those. Anyway, have a read and tell me what you think.
I need to post more anyway.