I was quite fascinated after watching Bad blood episode, that people from Victorian England world practices The Prayer Before a Meal that some Christians, in the Land without Magic, knew. Furthermore, in Land without Color, Christmas is celebrated (as seen in The Doctor). It is also interesting that the wedding of Snow and PC is officiated by seemingly a church official that looks like a Real world Christian leader.
The question is: how did Christianity reached them?
My theory is that some inhabitants could have come from the Land Without Magic and have spread any known religion to those realms. What are your thoughts?