The first thing that one should know and clearly understand about Islam is what the word Islam itself means. The religion of Islam is not named after a person, or a place, a tribe, a mountain or a river. Nor is the name just another-ism among the many that exist in the world today. The Arabic word Islam means the submission or surrender of one's will to the only true god worthy of worship, Allah (God in Arabic). A Muslim is the one who submits or surrenders his will to Allah. Hence, it was not a new religion brought by Prophet Muhammad (PBUH) in Arabia in the seventh century, but only the true religion of God re-expressed in its final form.
It came from what is today called Saudi Arabia. This caravan raider named Muhammed needed more soldiers for his army so he made up this story about being visited by an angel and told them that if they join his army and die in combat they'll get 72 virrgins in paradise.
Faith and Religion of Islam came into being at first when God sent Hazrart Adam and Hazrat Hawwa from sky to earth,Hazrat Adam preached His religion that is directed by God to him,then a lot of Prophet God sent to preach of Islam and directions of God,slowly different types of religion came into.