China has no official or national religion.
The main Iranian community in Brazil is in Sao Paulo where most of Iranian who do business are there, it seems the second community is in Brasilia, related to the family of personel of Iran embassy in Brazil. We have also Iranians in other cities, for example the main group of Iranian students and researchers are in Rio do Janeiro, however we have few more in other cities like Sao Paulo, Juiz de Fora, .... The website of the Iranian community in Brazil is at the Related Link below. where you can find useful information (in Persian) not only about Brazil, but also about Iranians who live in Brazil and you can also find photos and videos of Iranian national and religion ceremonies in Brazil. If you are thinking to study or immigrate to Brazil, i suggest you to have a look at the mentioned website.
Zoroastrianism was the main religion of Persia (Iran) before the arrival of Islam. Islam is the religion of Muslims. There are still some followers of Zoroastrianism in Iran as well as in Karachi in Pakistan and Mumbai in India. They are called Parsis. Iranian Muslims now mainly follow the Shia branch of Islam. They do not follow the main traditions of Zoroastrianism. It is possible that the Zoroastrian past of Iran has left some traces in modern Iranian culture.
The main religion is Christianity...
The main religion WHERE?
the main religion is cameroonian!
the main religion is Christianity, Hindu
Christianity is Alaska's main religion.
The main religion in Venezuela is Christianity
hindoo is the main religion in Fiji
Australia has Christianity as its main religion.
the main religion is bhudist