A member of the Open Democracy discussion forum on terrorism puts this question:
Are there immense cultural differences or many many core similarities among the various peoples in our world?
Like the terrorist/freedom fighter question, the question of which is greater, our similarities or our differences, has no fixed and final answer, because it depends on a judgment. If we look for differences, we will find differences, and if we look for similarities we will find similarities.
Someone who bases their identity in their nationality or their religion will be able to see only differences, and this will predispose to conflict. Someone who is secure in their identity as a human being, and moreover as a human being in harmony with their social and natural environment will be able to see the similarities. IMHO