” When Muhammad was trying to convert one of his fellow pagan Arabs to monotheism, the conversation probably went something like this:

Muhammad: “You know, worshipping all these pagan gods is really silly. There must be a supreme god, a “THE GOD” (the god is what Allah actually means). We already refer to the chief or head of the Kabah as “Allah”, lets continue to worship that god, but do away with all the others. I don’t want to discard the Allah, the Lord of the Kabah that we already worship, rather I only want to remove his wife and his daughters and all the other gods. And lets never refer to Allah again as “Hubal” or call him the moon god, because Allah, being our new monotheistic supreme god, created the moon. “

Quoted from:   http://www.bible.ca/islam/islam-encyclopedia-westerners-need-to-know-list.htm