The visibility of political systems based on Islamic ideals in the contemporary era has led the minds of the searchers to explain how these systems are treated with Islamic principles. In the current era, there are few countries that have a majority Muslim population and the ruling political system even seems to have its own adjective of Islam in face, but in the legal system of these countries there is no trace of Islamic law. However, regardless of the various types of communication between religion and government, one of the most important and most sensitive positions that reflect the behavior of countries with Islamic laws is current laws in countries, especially criminal and penal laws. The present article examines the legal systems of the four countries of Iran, Iraq, Saudi Arabia and Egypt, focusing on the models of communication between the Sharia and the legal system, so that the entry or non-entry of Islamic rulings into the criminal law of each one is clarified. In this article have been considered Iran and Iraq as two main sites of the Shias of the world with different legal systems, as well as Saudi Arabia and Egypt, as two powerful and influential Sunni stances, though distinctly different from each other.
