According to Muslims, only descendants of Muhammad should be allowed to fulfill the role of the caliph.
The God of Islam, can choose religious leaders and that all successors must therefore be direct descendants of Muhammad's family. They argue that after Muhammad's death, Ali, Muhammad's cousin and son-in-law, was the rightful heir to the leadership of the Islam religion.
A caliphate is an Islamic form of government in which political and religious leaders are united, and the head of state (the caliph) is the Prophet Muhammad's successor. Following the death of the Prophet Muhammad in 632 A.D., the first caliphate was established.
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