10secondsurvey - you're probably right. Sectarianism is best kept away from forums such as these. As you may have gathered, I love Northern Ireland - the province and its people and, yes my summarising is far too simplistic for a problem that has lasted centuries.
My experiences were based upon spending (too much) time in the British Army on street patrols or manning checkpoints. Maybe my description of "Scottish" celt or "Irish" celt aren't strictly accurate, but I maintain that I could (and so could my fellow soldiers) make a fairly accurate guess as to which persuasion a citizen in Ulster belonged to. (Perhaps the way people dressed, or the way they walked, or other features might have given a clue as well.)