What is the God of Christians?
I think it should be Allah because God created jesus, but jesus did not creat God.
For Muslims God is Allah.
Here is very good web site:
http://www.islam101.com/tauheed/conceptofGod.htm
and for more concepts you have a look at this also:
http://www.al-islam.org/concept/

Always be good and treat the people the way you want to be treated.