X-Men Resurrection Protocols...

[Le Messor]

Kurt joined the X-Men in his first appearance.

The demonic look / devout Catholic thing was always meant as an irony, but he debuted, with his demonic looks, in Gt Sized #1, just before ordinary-sized #94, and wasn't revealed to be Catholic until #167 - it wasn't part of his original conception. At least, I don't think so.

[Tawmis]

Yeah - I am not sure if it was always intended for the religious beliefs or not. But I did enjoy that it was a part of who he was (when revealed) - but I believe it's revealed in Issue #163 or #165... It's before 167. Because 167 is where they are back on Earth and fighting the Brood. And it's actually revealed while still dealing with the Brood in Space, when he speaks to Wolverine about it - if memory serves me right.

[Le Messor]

"And it's actually revealed while still dealing with the Brood in Space,"

Yes. I may have got the actual issue number wrong; but it's around there, and they are in space.