The availability of the books encouraged people to read or learn how to read more. This allowed people to draw their own conclusions about the Bible and other books instead of the church just leading them along.
It helped create chemical warfare
Yes, they use and believe in them. We can see this from shuls, the places they use to pray, as the 10 commandments are written and hung up. They also believe in the 10 Commandments since a great historical figure, Moshe was commanded to write them by Hashem, the God. Many people want to follow in Moshe's footsteps so they follow the 10 Commandments.
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Yathrib's residents had asked Muhammad to move to the city in order to bring strong leadership and peace. They sought Muhammad's counsel in brokering a peace between the warring tribed of Aws and Khazraj.
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