Rome's official religion was Christianity after 380 AD. Before this time there was no "official" religion as Rome was tolerant of all beliefs.
The emperor who made Christianity Rome's official religion was Theodosius I.
Because many Romans liked the religion as well as some of the people with more power.
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 in Puerto Rico.
There is no official religion anywhere in the United States.
It had no official religion except for trinitarian Christianity.
India does not have an official religion.
Romans had a polytheistic religion that closely paralleled Greek religion and consisted of multiple gods with human flaws interacting with the world and each other.
There is no official religion in Sweden since 1999
Christianity was adopted as the official religion of the empire in 380 AD.Christianity was adopted as the official religion of the empire in 380 AD.Christianity was adopted as the official religion of the empire in 380 AD.Christianity was adopted as the official religion of the empire in 380 AD.Christianity was adopted as the official religion of the empire in 380 AD.Christianity was adopted as the official religion of the empire in 380 AD.Christianity was adopted as the official religion of the empire in 380 AD.Christianity was adopted as the official religion of the empire in 380 AD.Christianity was adopted as the official religion of the empire in 380 AD.