This is not a question of region. It is a question of rationality. You have to judge the teachings of the prophets on rational grounds. For example, modern technology was developed mostly in the West, but all the nations of the world have adopted this western technology without questioning it. Then why does this question come up in the matter of religion? In the matter of religion too, you have to judge its teachings on whether or not they are rational, rather than question why one should learn Arabic language or follow the religion of an Arab Prophet.