Well maybe part of it is because they themselves are the ones saying it's in the name of Allah = God to the Muslim belief and actually, especially Obama like to point his fingers at Christians for past sins. There are also some small extreamist groups such as KKK who claim to be Christians but most other Christians reject their claims. No you cant blame them all or even a majority except for the fact they out number ISIS but 100/1 and are not standing up to them in their own country and coming to other countries then demanding special treatment.

There are pro and cons to the argument for sure.