Christianity is the most dominant religion.
The dominant religion of Iran is Islam (majority Shi'ite), while the Baha'i Faith is the largest non-Muslim minority religion.
The dominant religion in Azerbaijan is Islam, but due to the Soviet occupation, most Azeris are rather liberal in their religious outlook, especially when compared to the Azeris in Iran.
The most dominant religion is buddhism,then taoism,the islam.
Hinduism is the most dominant.
Hinduism is the most dominant.
Catholic
The most common religion for an Iranian girl is Muslim. The Muslim religion in Iran is the most common for all Iranians. Ninety percent of the total population in Iran is Muslim.
Iran
Christianity is the world's most popular and dominant religion.
Islam is the second most prevalent religion in the world. Like all questions of this nature the data available is "soft". The relative numbers for each religion is open to interpretation as some adherents feel others are not true believers and should not be counted.
Before the Islamic revolution, Islam was still the dominant religion, with most Muslims adhering to the Twelver Shi'a sect. The revolution was mainly to create an Islamic state and to overthrow the Shah, encouraging Islamic Unity.