Interesting that many of them are structured by Freud's ideas, gnosticism, Kabbalah, Christianity, perhaps a little Feuerbach (what with all of these divinities being projections...).
This got me thinking about what Kult might look like if you based it on other theories - Jung's archetypes, Hindu cosmology (the Archons could correspond to various gods) or Buddhism (in my game the PCs met some Awakening people who were aspiring to Achlys! they wanted annihilation or "bliss" as they called it).
Perhaps Awakening visions are still culturally informed - a westerner sees Archons one way, an Indian Hindu might see them as Kalhi, Shiva etc.
The cultural filters would be just another part of the Prisoner however - and getting beyond them would be essentially unplayable....
I think that when our games characters get to a certian point, things are likely to become surreal, figurative, amorphous.
As to Gaia being about feral human-nature - I like this idea, but don't think it would fit with my interpretation. As humanity have always been homo sapiens (at least in the Prison), and evolution was a lictor-lie, then our primal basis is actually our repressed divinity (desire, violence, etc), not evolutionary instinct. Gaia is something alien, humans aren't of nature - its why they build cities and seek to subdue, conquer and exploit nature (I'd like to say this at the Johannesburg summit! *L*).
Then again, if DU used Gaia (as well as Met.) in the creation of the Illusion, DU may have used elements of Gaia to repress humanity - their very flesh might be the stuff of Gaia. This might explain why Gaia is encroaching into Met. - humanities ex-home. But this would mean Gaia is still part of the Prison and an alien Emanation which must be escaped, used, destroyed (and humans have had lots of practice at that!).
As my characters become more divine, they become more technological and attached to the City - just like we are. The faerie characters become more elemental, faeral and without culture.
Though I've not really settled on any firm ideas...