Answer: Sunni and Shi'i are the two largest branches of Islam, with the overwhelming majority of Iranians practicing Shi'i Islam. About 90 percent of Iranians practice Shi'ism, the official religion of Iran. Armenians and Assyrians living in Iran are allowed to practise Christianity, but are often treated as second-class citizens. Churches are monitored and raided by the government and at least 75 Christians were arrested in Iran last year.
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