So as to avoid thread derailing.
However, if you took away religion, there would still be fighting between them because the reason they are fighting each other isn't because of religion, but because one of them are based on a freedom fighting organisation and one of them is based on an organisation that is in favor of british occupation (given that the unionists are british that's not surprising).
On the other hand, you have what the IRA became. We can trace many of our recent national heroes to the original IRA but we don't associate them with the kinds of people who, as you rightly pointed out kill pizza boys. They're different things.
Also, Chris, don't take it as if I support the current bunch of scum who purport to be freedom fighters. They've long since drifted from any kind of honour or valour associated with fighting for your freedom. They're just criminal, drug dealing, murdering scumbags.
I just don't like people who had legitimate cause to fight and did so in as fair a manner as one could hope for to be lumped in with what is now a criminal organisation.