God and King is of course the religious bit; literal usage of the title. Here in the Cathedral to the glory.. etc. As not everyone is a believer, it's an awkward one.   Though I also wince when I hear modern songs using archaic usage of Caledonia and Scotia.. I can't ever picture my own kids singing lustily away to it.   Highland Cathedral like all anthemic tunes has a bombastic feel, and the words Peter Kelly fitted to it, are equally over the top in that vein.. then that limits it as a choir piece, or for the trained tenor types.   It's just not a song of the people for the people. though occasionally you do hear it at events, as some choir or bandleader takes it up.