Islam in the Ottoman Empire
Islam was the official religion of the Ottoman Empire. The highest position in Islam, "caliphate", was claimed by the sultan, after the defeat of the Mamluks which was established as Ottoman Caliphate. The Sultan was to be a devout Muslim and was given the literal authority of the Caliph. Additionally, Sunni clerics had tremendous influence over government and their authority was central to the regulation of the economy. Despite all this, the Sultan also had a right to decree, enforcing a code called Kanun (law) in Turkish. Additionally, there was a supreme clerical position called the Sheykhulislam ("Sheykh of Islam" in Arabic). Minorities, particularly Christians and Jews but also some others, were mandated to pay the jizya, the poll tax as mandated by traditional Islam.
Christianity in the Ottoman Empire
The earliest converts to Islam came from the ranks of the Balkan nobility and military elites, who helped the Ottomans administer their native provinces. Although conversion was not required to obtain these posts, over time these local ruling elites tended to adopt Islam. Some scholars view proselyting Sufi mystics and the Ottoman state itself as important agents of conversion among broader populations. Other scholars argue that intermarriage and professional patronage networks were the most important factors of religious transformation of the broader society. According to Halil İnalcık, the wish to avoid paying the jizya was an important incentive for conversion to Islam in the Balkans, while Anton Minkov has argued that it was only one among several motivating factors.