Do Muslims and Christians worship the same God?

We have finished our epic two years long Bible studies. Six people went through the whole course, and overall 26 teens participated. One of the topics during first year (Old Testament) was:

Do Christians and Muslims worship the same God? 

In case you are bored during long, hot summer days, here are the sources to consider. If you want a clincher, go to the last article, and the last phenomenal quote of JP2. 

Helpful videos:

Broadly commented debate: Peter Kreeft and Robert Spencer:

with Spencer’s follow up article

Dr. Miroslav Volf (Episcopal) of Yale Divinity School delivers a lecture entitled "Do Muslims and Christians Believe in the Same God?" at George W. Truett Theological Seminary in 2009