"Let the Muslim be my master in outward things rather than the Latin dominate me in matters of the spirit. For if I am subject to the Muslim, at least he will not force me to share his faith. But if I have to be under Frankish rule and united with the Roman Church, I may have to separate myself from God." This was what the Patriarch Michael III of Anchialos (1170:1178) had to describe the religious situation in the 12th Century. On the eve of the fall of Constantinople in 1453, this view was more bluntly expressed by Duke Lucas Notaras in his famous words: "Better the turban of the Turk than the tiara of the Latin [Pope]." Moreover, during the Dutch Revolt, the phrase "Rather Turkish than Popish" was coined to express that life under the Ottoman Sultan would have been better than life under the Catholic King of Spain. Some used to wear a Dutch crescent-shaped medal, with the slogan "Rather Turk than Pope".
These incidents might be shocking for the Islamophobes whose campaigns against Islam became a career for them or a condition for holding some positions! It might equally be shocking for the general public who constantly receive negatives images of Islam and Muslims from the anti-Muslim media that vigorously works hard on presenting "The Islamic Threat" and creating the stereotype of the Muslim as violent and intolerant of other faiths. However, these historical incidents serve as an embodiment of the many Islamic teachings on coexistence, not just tolerance, with other faiths. This article seeks to identify some of the roots of religious tolerance in Islam and how European reformers, one of whom were ridiculed as 'Mahometans', came to admire the Islamic model of tolerance and called for adopting the religious diversity as ensured by the Muslim sultans.
At the time when many medieval Christian rulers raised the motto "One State, One Law, One Faith" as their government policy which inevitably led to many religious persecutions of different sects within Christianity, Islam introduced a completely different motto "There is no compulsion in religion" (Q. 2:256) which laid down the foundation for religious coexistence and non-interference with the beliefs of other religious communities. Even though this text was violated in few cases in later history, Bernard Lewis affirms that "In the early centuries of Islamic rule there was little or no attempt at forcible conversion, the spread of the faith being effected rather by persuasion and inducement."
What is so special about this Islamic motto? First, according to the above-cited verse, religious freedom was expressed as 'a statement,' not 'a command'. The verse did not say "Do compel others to leave their faith or embrace Islam;" rather, according to Arabic rhetoricians, the statement style indicates that religious tolerance has to be viewed as a nonnegotiable fact that cannot be abrogated, simply because compulsion is not an accepted conversion as God judges the heart, not the lip. Second, this verse was revealed in Madina when the Muslim community was considerably strong and had to deal with the presence of Jews and Christians therein. Third, some people or systems may endorse tolerance in areas that you do not value the most; for instance, religious practice could be tolerated because it is not crucial in a specific worldview whereas some political views could be suppressed in the same worldview. However, Islam adheres to religious freedom for non-Muslim communities in spite of the fact that the Muslim civilization is theothentric.
Above all, this motto was backed by a positive attitude towards the human nature in general and the Judeo-Christian tradition in principle. Contrary to the Christian belief in original sin and the assumption that non-Christians are sinning even during their sleep, Islam restored the faith of the early prophets who affirmed that people are born sinless and that sins are acquired, not inherited. Furthermore, based on its affirmation of the unity of the Divine message, Islam accepts Moses and Jesus as great prophets who belong to a long chain of prophets with Muhammad as the Seal of all Prophets. Accordingly, a Muslim does not see himself or herself following one of the conflicting religions but embracing the same faith shared and taught by all of God's prophets.
Due to this positive worldview, Muslim medieval history records unique moments of free thinking and interfaith dialogues and debates about religious and philosophical issues, using reason alone with no references to one's scripture. In his biographical work Jadhwat al-Muqtabis, al-Humaydi (d. ), tells the story of Abu 'Umar ibn Sa'di who records his experience as follows:
"At the first session I attended I saw a majlis [gathering] which included every kind of group: Sunni Muslims and heretics, and all kinds of infidels: Majus, materialists, atheists, Jews, and Christians. Each group had a leader who would speak on its doctrine and debate about it. Whenever a leader arrived, from whichever of the groups he was, the assembly rose up for him, standing on their feet until he would sit down, then they would take their seats when he sat. When the majlis was jammed with its participants, and they saw that no one else was expected, one of the infidels said, "You have all agreed to the debate, so the Muslims should not argue against us on the basis of their scripture, nor on the basis of the sayings of their prophet, since we put no credence in it and do not acknowledge him. Let us dispute with one another only on the basis of arguments from reason, and what observation and deduction will support." Then they would say, "Agreed." Abu Umar said, "When I heard that, I did not return to that majlis. Later someone told me there was to be another majlis for discussion, so I went to it and I found them involved in the same practice as their colleagues. So I stopped going to the majalis of the theologians, and I never went back."
Besides the freedom of faith granted to non-Muslim communities, this sense of religious tolerance, coupled with Muslims' interest in and sponsorship of all fields of knowledge; led to the flourishing of religious study in non-Muslim faiths as the leaders of these faith were motivated by the academic disciplines Muslim scholars expanded or even originated. For instance, the Jews, who suffered persecutions under Christian rule on account of the accusation of killing the Messiah, were encouraged, under Muslim rule, to engage in the philosophical, legal, ethical, linguistic and religious discussions of the day. Saadia's The Book of Beliefs and Opinions, Maimonides' The Guide for the Perplexed, Ibn Paquda's Duties of the Heart, Solomon ibn Gabirol's The Improvement of the Moral Qualities and Ibn Kammuna's Examination of the Three Faiths, Judah Halevi's The Book of Refutation and Proof on the Despised Faith and Al-Qirqisani's The Book of Lights and High Beacons or Kitāb al-Ānwār wal-maraqib are just few examples of medieval Jewish works originally written in Arabic and greatly influenced by Muslim works and spirit.
This religious tolerance was clearly noticed by many European theologians, philosophers and reformers and advocated as a model of religious tolerance for Europe to follow. For the sake of brevity, two tolerance advocates will be cited here to illustrate the European fascination with the Islamic model of tolerance as part of their attempt to encounter the wave of inquisitions and religious persecutions.
First, based on a Protestant city council, Michael Servetus (d. 1553) was tried and burned alive for heresy as he denied the Trinity, the incarnation of Christ and some other doctrines. Trying to put an end to such bloody acts, Sebastian Castellio (d. 1563) records this testimony:
"At Constantinople there are Turks, there are Christians, and there are also Jews, three peoples widely differing from one another in religion. Nevertheless they live in peace, which certainly they would not do if there were persecution. A careful investigation will reveal that persecutors have always been the cause of great troubles. Wherefore, Princes and Magistrates, if you desire peace and tranquility, do not listen to those who incite you to persecution, for they are seditious ..."
Second, based on perjured witnesses, a Protestant figure Jean Calas was accused of killing his son Marc-Antoine to prevent his conversion and thereby executed in 1762. Following the trial of Jean Calas, the famous French philosopher Voltaire writes his Treatise on Tolerance to display the Catholic fanaticism. Among the examples he cited as a model of religious tolerance, Voltaire calls on his people:
"Let us reach out from our narrow little sphere for a moment, and examine what goes on in the rest of the globe. The Turkish prince, for example, rules peacefully over twenty races of different religious conviction; two hundred thousand Greeks live in Constantinople in perfect safety, and the Mufti himself nominates and presents the Greek patriarch to his emperor; there is even a Roman Catholic patriarch living there. The Sultan nominates Catholic bishops to some of the Greek islands, with the following words: "I commend him to go and reside as bishop on the isle of Chios in accordance with its ancient customs and vain ceremonies". This empire is stuffed with Jacobites, Nestorians, Monothelites, Coptics, Christians of St John, Jews, Gebers, and Banians. The annals of Turkey bear no record of a revolt raised by any of these religious communities."
These two examples illustrate that, in the middle of religious persecutions in Europe, some tolerance advocates made allusions to the Islamic model of governing to conjure up images of tolerance and coexistence to save medieval Europe from religious prejudice and pave the way for the Enlightenment. All in all, religious tolerance with other faith communities has been part and parcel of the Muslim civilization. For those who want to know whether ISIS is true Islam or Un-Islamic, ask Sebastian Castellio or ask Voltaire!
 Christopher Allmand, Rosamond McKitterick (ed.), The New Cambridge Medieval History: Vol. 7, Cambridge University Press, p. 782
 For more details, see Benjamin Schmidt, Innocence abroad: the Dutch imagination and the New World, Cambridge University Press.
 Bernard Lewis, The Jews of Islam, Princeton University Press, p. 17
 Abu 'Abd Allah Al-Humaydi, Jadhwat al-Muqtabis, Cairo, 1953, pp. 101-102, cited in The Majlis: Interreligious Encounters in Medieval Islam edited by Hava Lazarus-Yafeh
 Sebastian Castellio, On Heretics: Whether They Are to Be Persecuted and How They Are to Be Treated, transl. R Bainton, Columbia University Press, p. 225
 Voltaire, Treatise on Tolerance, Cambridge: Cambridge University Press, 2000, p. 20-21