There is truth in what you say -- nations in the Middle East are described as theocracies, or governments guided by strict religious principles. Saudi Arabia is an Islamic theocracy, dominated by Sunni Muslims, while Iran is dominated by Shia Muslims.  If you accept a work contract in Saudi Arabia, and if you are Christian, you are told that churches are illegal and banned there, so practise your religion privately at home -- out of sight of the Religious Police who assess public behaviour for conformity to Islamic principles.