The official ideology is socialism and one political party ruling.
China has no official or national religion.
Buddhism is the official religion of China. Buddhism per say is not quite a religion but rather it is a self-help instruction involving cause and effect and how to better one's self.
There is no 'official' religion in the USA
Islam is the official religion in Afghanistan.
Theres no official religion in Tanzania. The government do not have religion, the citizen do have.
There is no official religion anywhere in the United States.
There is no Official religion in Puerto Rico.
It had no official religion except for trinitarian Christianity.
India does not have an official religion.
The official name of China is the People's Republic of China (PRC).
There is no official religion in Sweden since 1999
Rome's official religion was Christianity after 380 AD. Before this time there was no "official" religion as Rome was tolerant of all beliefs.