“Muslim” is a religious term. A Muslim is someone who adheres to the religion of Islam. “Arab,” on the contrary, is an ethno-linguistic term. An Arab is a member of the people group who speak the Arabic language. It is true that Islam originated among the Arabs, and the Qur'an was written in Arabic. However, some Arabs have historically been part of the ancient orthodox Christian churches. On the other hand, Islam spread far beyond the Arab world, and today . This includes the Turks, the Kurds, the Iranians, the Pakistanis, other South Asian Muslims, the Malaysians and the Indonesians, almost all of whom are Muslim but none of whom is Arab.