In the days of Moses, blasphemy was the mortal offence of failing to respect the divine. In an age of human rights, blasphemy is understood as a failure to respect persons, as insult, defamation, or "advocacy of religious hatred." The criminalisation of this personal blasphemy has been advanced at the United Nations and upheld by the European Court of Human Rights, which has asserted a universal "right to respect for religious feelings."

The Future of Blasphemy turns respect on its head. Respect demands that we grant each other equal standing in the moral community, not...