Interesting statistics and I for one will back up your analysis. But the Alpine woolly mammoth in the room is that, in 21st-century Europe, "cultural and religious diversity" does not, for most people, imply a heterogeneity of Germanophones and Francophones, or Protestants and Catholics. It means something else.

Sorry if cultural history and facts are a bit dull. I don't really want to argue about *something else* though; let's leave that to the *something else*ists.

Can you say the quiet part out loud, please? I'm having trouble hearing what "something else" is meant to convey.