Extra info on Muhammed:

http://www.wikipedia.org/w/wiki.phtml?search=Islam&go=Go

quote:

His basic message was one of belief in one God, respect for morality above and beyond tribal links, and prayer. As the ranks of his followers swelled, he became a threat to the local tribes, especially the Quraysh his own tribe whose responsibility it was to look after the Kaba, which at this time was home to the several thousand 'idols' that people worshipped as gods. As Muhammad preached against this pantheon he became deeply unpopular with the rulers and his followers suffered from repeated attacks to person and property. Eventually there was an assassination attempt. He was forced to flee Mecca on July 16, 622; this is known as the Hijrah, and it is the date that marks the beginning of the Islamic calendar.

Muhammad went to Medina (at that time known as "Yathrib") where he was invited to become ruler of the town by a large group of residents. He declared a welfare state, collected taxes for the needy, organised town defences against numerous raiding parties from Mecca and beyond, and entered numerous trade agreements. He built mosques, and established a religous culture based on respect for other religions and their freedom to practice (the town also was home to a number of Christians and Jews). He is credited with creating the first Constitution.

After the repeated raid attempts on the town, Muhammad and his followers began to raid the raiders' caravans, in retaliation and he distributed the treasure equally amongst his followers. By 627, Muhammad had united Medina under Islam with protected privileges for the Jews and Christians who lived there. Word of the new religion, with the peace and prosperity it brought spread by trade.

So what do we have here? Peace, tolerance for other religions, the first constitution, a welfare state, morality, monotheism. I see no violent source, as Dave claims.