When Muhammad was 6 his father died and later his mother died. He was now an orphan
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Muslims believe that god had spoken to Muhammad through an angel and mad him a prophet.
Muhammad thought that there was only one god "Allah". At the time many people believed in more than one god. Muhammad's teaching upset many Arabs. At first they didn't like being told to stop worshiping their gods and goddesses.
Muhammad said that "Everyone who believed in Allah would become a part of a community and rich or poor there all equal". People didn't like the idea of that so they left.
People began to threaten Muhammad and his small group of followers with violence and even death.
They finally let Muhammad be welcomed back and they let Islam be their religion.