I know sooooome of 07 Ghost but I didn't get all that far. I think Teito and Frau just left the church to go on some adventure when I stopped reading.

Hmmmmm he could definitely fall into either category, as Teito himself would line up with the miracle one, but another god would be seen as competition. >.> So it's whichever you wanna do! If you wanna have both though he could fight Leviastiel, who can be fought off with borax to prevent death easy enough. :3