Well as far as the religion, Islam is concerned, it commands that there should be no discrimination on the basis of race, creed or colour of Skin. There is a verse in the Holy Quraan, I cant refer to it as I dont remember it, but it says 'no man is better than the other, or no Arab is better than a Non Arab except for in TAQWAA' (Taqwaa, I think means submitting to Allah)
So its not the religion... Its the people, and the money that they have...
Someone had rightly said about the Arabs that their transition from the camel to the caddilac was very fast and the return will be faster. So thats not because GM will stop supplying Caddilacs to the Arab world but because of their attitudes.
All I can wish for is May God help them and guide them to the right path.