My parents went to Ireland recently, and they said they learned that the whole Catholic vs. Protestant divisiveness over there is not actually about faith at all, but is simply a culture war. They also were told that basically anyone who isn’t Catholic is a “Protestant”, even if they are atheist or Muslim. Doctrinal disagreements have nothing to do with it.
I feel that many people who proclaim themselves as Christians just take the label as though passed through the family, or else are a part of the culture but pay no mind to actually what it means to follow Christ. As though being a Christian is merely fire insurance.