Even if I agree that there is no problem here, I consider that blasphemy is a weapon to use carefully. In Europe, we can't treat Islam like we treat christianity, muslim are in a situation of oppression so we must stay careful.
On the other hand, in Islamic countries like Iran for example, we can't treat other religions like we treat Islam. For the same exact reason.
Etc.. for others country with different religious formation.
Where there is oppression, blasphemy must not become a weapon to oppress even more. On the other hand where there is hegemony, its a good tool to raise questions.