Original sentence: Most Iranians are Muslims; 89% belong to the Shi'a branch of Islam, the official state religion, and about 10% belong to the Sunni branch, which predominates in most Muslim countries.Non-Muslim religious minorities include the Bahá'í Faith, Mandeans, as well as Zoroastrians, Jews, and  Christians.Numerous indications reveal that a considerable proportion of contemporary Iranians profess to religious views only nominally or as a tradition, despite the state's practically enforced ideology of assimilating state and religion on all levels
Edited sentence: Despite the state's practically enforced ideology of assimilating state and religion on all levels, numerous indications reveal that contemporary Iranians profess Islamic religious views only nominally or for legal purposes.For alternative political reasons, the Baha'i Faith has been determined by the Republic as an illegal religion.However, because the Islamic Republic of Iran practices the state regulation of religion, publicly changing one's belief system away from Islam is punishable by death.It is commonly considered that most Iranians are Muslim; a popular statistic claims that 89% of Iranians belong to the Shi'a branch of Islam, the official state religion, and about 10% belong to the Sunni branch, which predominates in the arab communities.Religious minorities include the Bahá'í Faith, Mandeans, as well as Zoroastrians, Jews, and  Christians.Unfortunately, the Republic's regulation of religion has quieted the ethnic and religious diversity that has existed in the country since its inception by Cyrus the Great in 550 BC