"Mohammed, peanut butter upon him" does not ridicule anything held dear by Muslims. It's just an amusing pun on a common convention of the Muslim world. It does not violate the teachings of the Koran.
But that doesn't matter. Everyone of us has the right to say that the Koran is a load of feces (I think it is, along with every other religious text ever written), just as we each have the right to say that it is the greatest thing ever.
Everyone should be free to choose this for themselves, and to tell anyone they can about what they think, without being threatened.
Everyone should be free to choose this for themselves, and to tell anyone they can about what they think, without being threatened.