The reason to do this is the dingbats of 'the religion of peace' have taken a sensible measure against idolatry in the form of worshipping Mohammed and twisted it into a measure that threatens violence if anybody makes any depiction of Mohammed, no matter how removed from reality. This has come up practically in South Park (yes, that South Park) as Comedy Central has recently censored a bear suit Mohammed as well as an episode finish speech on the value of not giving in to intimidation that does not mention Mohammed at all.
I look forward to all the art classes in our area participating in this important exercise in free speech... oh who am I kidding. Those of you with the guts to do this, I look forward to seeing your efforts.
[update]
If you're looking for inspiration, non-pinhead muslims have drawn Mohammed plenty of times. A good collection is maintained by Zombietime.
