Bielefeldt said the Federal Court ruling on June 23 which upheld the ban was unprecedented.
“My reaction and that of everyone else was how can this be possible, it is bizarre, strange and totally unacceptable,” he added.
“In fact, this is not an infringement of human rights, it is a clear violation of human rights.”
He added that he was not aware of any comparable court decision in any other country that prohibited the use of the word by non-Muslims.
He pointed out that Christians in the Arab world had been using the word for thousands of years.