Three religions ... one God?

There are three major religions in the world today: Christianity, Judaism and Islam. Though these belief systems intertwine throughout history, they are in fact extremely different in both basic structure and ultimately, in deity. Many people have claimed over the years that the God of Judeo-Christianity is in fact the same god of Islam. However, due to key points of differences in their respective religious texts, as well as the nature of God versus Allah in the everyday life of those who practice these religions, it becomes clear that God is in fact a completely separate entity from the Islamic Allah, despite the fact that Allah is the Arabic world for "God".