I have never understood the concept of blasphemy.
If you are in a position of authority - a teacher, a manager, a team captain or a parent there is no surer sign of your confidence and authority than to take the piss out of yourself or to allow others to do so. In fact it is almost an acid-test of your authority if it can survive ridicule. As a human being, the same ability is actually a test of your humanity - to fail it renders you at best pompous and at worst psychotic.
So why should the (supposedly) biggest boss of all any different?
Woody Allen quipped that God may be omnipotent but he clearly has self-esteem issues. Which I guess is why all religions seem to have a supreme being who requires constant reassurance in the form of worship and who is strictly off-limits from any kind of ridicule.
Following the latest obscene attack in Paris by Islamo-fascists on those who dared to mock them and their ridiculous medieval world view, we are inevitably going to see a wave of vicious Islamo-phobia. However, the best, and only, response, is to emphasize the unity of our common humanity - and to continue fearlessly taking the piss.
Just as the cartoonists at Charlie Hebdo did.