[semanticist]

The violence associated with football in Glasgow is literally religious - it's an example of Christian sectarian violence.

Attacks on Christianity don't get the same reaction because in most places it's the dominant religion, but that's not to say there's not violence associated with Christianity. The history of Northern Ireland is more complicated than simple religion, but that is an important aspect of the Troubles.

[ErrantX]

Extremely good point; I hadn't considered that.

I'm not sure it entirely invalidates my theory - but it certainly makes it more complex :) cheers.