Why don't atheists mock Islam or the prophet Muhammad?

They seem to mock Christianity but not Islam or Hinduism. It almost seems as though, the atheist is nothing but a schoolyard Bully. They know Christians are not going to retaliate, but Islam or any other religion will not allow derogatory remarks against their God or prophet at least not without some... show more They seem to mock Christianity but not Islam or Hinduism. It almost seems as though, the atheist is nothing but a schoolyard Bully. They know Christians are not going to retaliate, but Islam or any other religion will not allow derogatory remarks against their God or prophet at least not without some payback.

There are no atheists in Iran or Saudi Arabia degrading Muhammad on the radio stations or internet.
Update: Thanks for your responses.
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