Don't tribes and nations tend to be exclusive?
It's part of our reality .. I see that religion is able to break through that tribal barrier.
..as are political ideologies.
You seem to see religion as the main culprit .. and do not consider the political
differences between parties as being the main reason for conflict.
Of course, our beliefs are often connected with our political views.
One example would be the dislike of communist regimes who oppressed Abrahamic religion
in the past.
Political ideologies often clash .. some people like G-d .. and some people like Karl Marx etc.