I highly condemn on the act of making fun of someone's religion or their belief.I really don't know we are living in 21st century, behaving like the 1st century, or they might been better than us I should say.
People calling this as A FREEDOM OF SPEECH, so let me tell them feedom doesn't allows people to hurt their feelings, create hatred speeches ,making fun of their believes or to start some kind of cartoon competition!
We Muslims can accept things against us but not our Prophet S.A.W .He is still the best person ever lived!
May Allah help us understand and make this world a better and peaceful place.Ameen.