They're probably something similar to Anglican. Mollys will be Catholic.:D
See, that's what I've always had a bit of trouble with on the Mollys. The British (Bretonia) didn't just subjugate all the Irish and put them to work in the mines, did they? There's Brets in the Mollys too, it's more deposed miners than anything else, not a nationality.
That'd be like the Japanese on the Kusari immediately isolating all the Ainu and turning them into a servant class once they got off the ship.