I don't believe he is a muslim. I believe he is a rabid, foaming at the mouth, anti-christian atheist who only supports muslims because in his mind they are a persecuted (by white christians) minority who only lash out due to their justified anger at said persecution. He sees everything through the eyes of a 1st year sociology student where all badness in the world is born out of anger from some sort of White/Christian oppression. Thus, if you allow the persecuted groups (gays, muslims, blacks, women, mexicans, snail darters,...) to thrive, the anger will subside and the world will be at peace. Well, except for those White/Christians, who of course will need to be taught a lesson.
No, he is no Muslim, he is a dangerous spiteful atheist who is playing with fire way beyond his feeble mind's ability to control. If he even cares if it gets out of control. Which he very well may not. IMHO.
Hitler mentioned he did not believe in God and hated all religions, but if there was a good religion, it was Islam according to him.
I agree with your assessment.