The strange thing was that I couldn't get it in any of my cities including the capital. I'm using the Marvel Super Civs Pack and not this as an individual sub though.

@Ralfil, I don't believe that's a bug my mods introduced. Make sure whatever cities you're trying to build it in actually HAVE that new religion, as, except for the capital, you need to let the newly founded religion propagate through your empire. You could actually get every religious building in the game in any given city if you let one religion rise in popularity, buy the building, then have another replace it, ad naseum.

While I had no problem selecting the bonus belief, for some reason it wont let me use it. I selected Cathedrals and can't build them.

ok, thank you. And thanks for the mods, they'r ereally fun!

@Post Scriptum I've gotten similar feedback already, so it's probably something that I'll add soon.

i think you should give a slight tweak to the civ's UA. when depending so heavily on faith - both UA and UB - you really should give them a chance to get it. +1 faith in capital would be good enough imo.