Quote from stu:
A substantial part of the disagreement between sunni and shiite is connected with Muhammad's legacy of the Islamic State within the Arabian Peninsula along with its Muslim inhabitants. So therefore at its root, it is all to do with occupation. As Islam is Law and Religion combined, inevitably the ruling sunni or shiite sect would consider themselves the true prophets of Mohammed and control lands and the people of Islam accordingly.
It is very plain to see the obvious comparison with the heavy influence religion plays in segregating Catholics and Protestants both politically and culturally in Northern Ireland, culminating in the vicious and violent moronic acts of brutality and murder toward the defeat of one religious sect over another. The IRA has been clear in stating and demonstrating its desire to destroy the Protestant population and Catholics have responded in kind. Christian fighting Christian in the name of politics and occupation.
I suggest you will appreciate it would be highly unwise for your good health to try occupancy in a Catholic housing estate, or occupying a house in a predominantly Catholic area if you are a Protestant, or vice versa of course for Catholics.