Predominantly a Muslim nation, Iran has a sizeable Christian population. Majority of Iranian christians are Armenian-Iranians also known as Parska-Hye who follow Oriental Orthodox branch of Christianity and celebrate their very own special festivals and traditions. Apart from them are also Assyrians, Catholics, Protestants and Evangelical Christians.
Every year, the Iranian Christians celebrate the occassion by decorating Christmas trees, exchanging gifts, and attending services. During Christmas season, Christmas Trees can be seen from Windows in Tehran and north-western provinces of the country.