In the Middle East, many states with primarily Islamic population have Islam as their state religion, though the degree of religious restrictions on the citizen's everyday life varies by country. Rulers of Saudi Arabia use both secular and religious power, while Iran's secular presidents are supposed to follow the decisions of religious authorities since the revolution of 1979. Turkey, which also has a primarily Muslim population, became a secular country after Atatürk's Reforms, although unlike the Russian Revolution of the same time period, it did not result in the adoption of state atheism.