I'm trying to think of any Palestinian exports...
As for having so much in common, it's no surprise. After Judaism came Christianity and after Christianity came Islam. They all share different aspects but all seem to focus on the differences.
It was interesting watching the Kate Humble programme. It was an eye opener seeing Christian Palestinians playing bagpiped renditions of Christmas carols while other Muslim Palestinians were being called to prayer at the Mosque.
It was all very harmonious.
That's the thing, it could be, all the religions have commonalities.