What's the Difference Between Shi'ia and Sunni Muslims? Sunni Shi'ia All Middle East countries other than Iran and Iraq. Iran and Iraq Who (specific person) should take over after Muhammad's death? Why should he take over? What does Sunni/Shi'ia mean? What % of Muslims do they make up in the world today? What countries are they a majority in? What do they prefer to call themselves? How do they view Imams (descendants of Muhammad)? How do they view the religious texts that were written by Muhammad's companions? Sunnis have incorporated them into their religious practices.