Being married to one (and being a panentheist from a Protestant and Catholic Northern Irish family) I can tell you that my wife doesn't like pictures of the prophet Muhammed because in their religion, the prophet is the messenger, not the message. It's as much a part of their religion as making the old joke about Jesus walking into a bar with two planks of wood and some nails and asking if he could be put up for the night.

While it's fun for some to mock part of someone elses religion and I absolutely advocate free speech we need to see this as what it is. It's trolling. If you want to stick it to the extremists then do something the moderates can unite with you against them. No moderate could support EDMD because it specifically goes against the teachings of one of their holy books.

Rather than ask for a response that a peace loving muslim might give an extremist muslim, ask yourself what a peace loving Christian would give by way of a response to an extremist Christian should Jesus be mocked. There you will find your answer.

Interestingly (or perhaps not) this doesn't just apply to Mohammed. This applies to all prophets in Islam, including Jesus and Moses. It's because idolatry is the worship of something other than god and to muslims there is only the one god, although he's the same god as the god in all Abrahamic faiths, just interpreted differently.