Protestantism and Catholicism must not be compared to Sunnism and Shi'ism in the Islamic context as has been done by certain scholars. Sunnism and Shi'ism both go back to the origins of Islam and the very beginning of Islamic history whereas Protestantism is a later protest against the existing Catholic Church and came into being some fifteen hundred years after the foundation of Christianity.

— Seyyed Hossein Nasr

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