For many Muslims the name Voltaire is one held in anathema. His rationalism is not the issue, but he is forever scarred as the author of a play in which Mahomet is the icon of fanaticism. While it is obvious that the real target of the play was Catholicism and not Islam, the mere fact that Muhammad becomes the scapegoat is a difficult trope to accept for quite a few Muslims. But Voltaire often praised Islam in contrast to the blood-crazed Christianity of his day. Consider the following comment:
The legislator of the Muslims, a powerful and terrible man, established his dogmas with his arms and courage; however his religion became indulgent and tolerant. The divine institutor of Christianity, living in peace and humility, preached pardon, and his holy, sweet religion became, through our fury, the most intolerant and barbaric of all.
Or the following, preferring Islam over ancient Judaism:
The Arabs were never seen invading their neighbors like ravished carnivorous beasts, nor were they seen slaughtering the weak, claiming divine orders as an excuse, nor were they flattering the powerful with false oracles. Their superstitions were neither absurd nor barbaric. They are never mentioned in the universal histories fabricated in our part of the world. I sincerely believe that they have no relationship to the small Jewish nation that has become the object and foundation of our so-called universal histories, in which a certain category of authors forget three-quarters of the world as they copy each other.
All quotes from Ziad Elmarsafy, The Enlightenment Qur’an: The Politics of Translation and the Construction of Islam (Oxford: Oneworld), 2009, pp. 101, 112.