I think Gaia fits because as a personification of the Earth, Gaia was also often associated with fertility and abundance...which very much fits with a "super inhabitable" world. To me it conveys that there's a lush abundance of edible plants and animals that are just there for you to take, as well as very fertile soil and favorable, stable climate conditions.
However I don't agree that "Eden" is solely a religious. Maybe it's because I'm from a fairly secular society, but if I hear the name "Eden" without any additional references to anything religious, I think of a untouched place of great, natural beauty. Same with Paradise.
I suppose it could be changed to "Paradise World", but I don't think it's necessary, since to me Gaia already conveys the idea of abundance and hospitable environments. What would be a more favorable place than Mother Nature's personal garden?
Plus Paradise world would sound kinda odd in case you turn it into a forge world or a factory world or whatever...