If only those Canaanites had a coherent immigration policy and a fence! Oh, wait! Wasn't that the ideas of the wall around Jericho?

Many, virtually all the Arabs before the time Of Mohammad had household god and goddesses, tribal gods and the like in addition to a proper healthy respect for the major gods of the region. Allah was a tribal god. It was Mohammad who declared Allah to be the one god and identified him as one and the same with the god of the Jewish Torah. Their claim is that of being the firstborn of Abraham and this claim is NOT disputed in the Bible. The mother, however, was NOT Abraham's wife but his wife's servant. Check out Genesis for the details and you might check out the Book of Hebrews in the New Testament to see Paul's (?) take on the story.

Back to history. Mohammad realized that the Jews and the Christians both had a unifying factor that the Arab people did not in having one god and no other. You have to give him credit for being a real organizer and a great leader for unifying his people under Allah and settling the endless picayune disputes that kept them at a tribal state. United they were able to throw off the yoke of oppression at the hands of both the Jews and especially the Christians of that time. They emerged as a world power of their day. If the people had any doubts of Allah before then, they were gone with the ousting of the foreign powers.

You don't have to read very far in the Koran to realize that it is a mishmash of the Jewish Bible, the pseudoepigrapha and New Testament as well as the history of their struggles. More on this I won't say because I have neither the time nor the energy to wade through the morass of three major world religions and their theology in this forum. Have at it kids!