Oxford Dictionary of World Religions, p. 48
"Before Islam, the religions of the Arabic world involved the worship of many spirits, called JINN. Allah was but one of many gods worshiped in Mecca. But then Muhammad taught the worship of Allah as the only God, whom he identified as the same God worshiped by Christians and Jews."
Someone asked me for another source that shows Jinn's are myth, so there it is. To who-ever asked me, thanks for your interest.