If your name is Mohammad you were born to Muslim parents, regardless whether you practice or not, or whether you apostate outright.  So  perhaps he's nominally "Muslim" like, say, Tammy Faye Bakker is nominally "Christian".  Or an immigrant kid seduced by a permissive, degenerate society into violating his Faith's tenets.  Allah knows, we know not.  But there appears to be no doubt as to his crime, and I will neither excuse nor minimize it simply because he's (nominally) Muslim.