Here's one that nobody has mentioned, FoL/Infernals. I've never actually used FoL as them, but I did get it spread to my city once (through a tech trade, which gave me a disciple). Which is what made me think of this combination. Honestly though, FoL is the complete opposite of what the Infernals are. I was thinking that they could worship it, in a very twisted inhuman (yes I mean inhuman, not inumane) way. Since the Infernals are all about death and hell, I find it hard to imagine just what the infernals would be doing with FoL. The closest I could probably think would be out of some sci-fi/horror thing. The Mercurians would fit with FoL better because they want life to exist, even though Basium's ideology is more of a 'get in my way and die' ideology.