Shield of Christianity - what does this mean?

[weregamer]

Am I supposed to use any of the variants of Christianity, or make up a custom one with that name? Please tell me some bigot didn't define "Christianity" as a specific variant...

[tempest.of.emptiness]

Based on a quick web search it looks like the religion you need to be following is Catholicism. I doubt that this is the result of bigotry. More likely the achievement is intended to be an historical reference to Matthias Corvinus' resistance against invasion by the Ottoman Empire. The text describing the achievement should probably be changed to reflect the need to be following Catholicism specifically.

[weregamer]

It certianly makes more sense than having to do a custom religion, though it's odd that it wasn't caught in QA.

I guess I'm a bit oversensitized, growing up Catholic 40 years ago, to how many people claimed that only Protestant religions were Christian - specifically excluding Catholics and Orthodox. That may still happen in backwards areas, but I don't think I've seen it in the last 20 years or so.