Okay, I had an idea regarding the Covenant. Instead of creating an entirely new faith like that, why don't we instead say that it's a "rediscovery" or "rebirth" of an older, more obscure religion like Neoplatonism, Hermeticism, or something like that? It's possible to link any of these with the major Abrahamic religions. If we're willing to again genocide butterflies you could even use Sol Invictus or something. It's up to you Terran I suppose since it's your idea, but this is my input. Or, you know what, maybe not Sol Invictus, as Sol Invictus sounds kind of like what Imperial Hellenism seems to be. In other religion-related ideas, I came up with a new plan: keep Mithraism in India (as the deity did exist in India), but replace it with Manichaeanism in at least parts of Southeast Asia, because I feel it's better that both exist as semi-major religions to make things interesting.