I am okay with my favorite Muslim gunwriter using artistic license when telling a story.
As far as I know he is only Arabic, not a "Muslim". Even if he does practice Islam, identifying someone solely by their religion in a sarcastic tone is rather disrespectful, both to the religion and the person. Making an assumption based upon someone's ethnicity is even more so.
Anyways, can you imagine how that trial would have gone today? The mainstream media would have a heart attack!