From all that I have played and read in the Xeno series, the stories have had some sort of religious theming. Maybe not direct references to European religion, but talk of godhood, etc. I think this is interesting, but then again, many JRPGs have themes of destroying gods and such.
With Xenoblade Chronicles X, the story seems to be more evocative of Space Opera or hard Sci-fi, so maybe religious themes would be downplayed, or at lead relegated to philosophical musings made by characters. But I do agree that naming something with a religious title just for the sake of it isn't necessary. If you strip a character of their own beliefs for the sake of remaining family friendly, however, I'm not too keen on that.