He wouldn't be a disgruntled ex-convert to the religion of peace, would he? And would they tell us?
That sign he's making is 'allah is one and has no partners' in case no one noticed.
You have made a very interesting observation. I believe that he is a disgruntled former student of Islam or else he knows enough to actually mock Allah.
Allahwahoo Whackbar! ( grin.)