Belt (2002) noted that Islam was well established at the time of Muhammad's death in:

Name: Belt (2002) noted that Islam was well established at the time of Muhammad's death in:
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Belt (2002) notes that Islam was established in the Arabian Peninsula at the time of Muhammad's death, as this is where he lived and preached, and where the initial growth of the religion took place. Islam did not reach other parts of the world until later in its history.

Belt (2002) Noted That Islam Was Well Established at the Time