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 Ottoman Empire constantly formulated policies balancing its religious problems. The Ottomans recognized the concept of clergy and its associated extension of religion as an institution. They brought established policies (regulations) over religious institutions through the idea of "legally valid" organizations. But all had to accept Islam as dominant, and could not criticize Islam or the Sultan. To do so invited execution.