Indeed. In Ireland, especially Northern Ireland, religion is far from the only major difference between the two main groups (Catholics/Nationalists/Irish/people who say “Derry”/people who say “haitch” and Protestants/Unionists/British/people who say “Londonderry”/people who say “aitch”, for lack of any completely satisfactory one-word labels for the groups.)

(My spell checker is clearly Protestant, as it flags “haitch” as incorrect.)