Not all versions of Christianity were made official religion. Only the two branches of mainstream Christianity were made state religions.
The co-emperors Theodosius I and Gratian issued the Edict of Thessalonica in 380. This made mainstream Christianity (Latin or Western Christianity and Greek or Eastern Christianity) the sole legitimate religion of the Roman Empire. The purpose of the edict was to ban dissident Christian doctrines, which were branded as heretic. Their persecution started soon afterwards. The main target was Arian Christianity, which was popular around the empire.
The Latin/Western Church and the Greek/Eastern Church were the main church of the western and eastern part of the empire respectively. They were two branches of one church which was called Catholic Church. They both subscribed to the Nicene Creed, a particular interpretation of the trinity, and opposed alternative interpretations of the trinity. Later these two churches spit and came to be called Catholic and Orthodox respectively.
Theodosius I immediately started to persecute the dissident Christian doctrines in the eastern part of the Roman Empire, especially Arian Christians.
In the fourth century King Ezana, converted to Christianity and was baptised as Abreha,
After the Emperor Constantine converted to Christianity, that became the official religion of the Roman Empire.
Because of Christianity growing stronger, the Roman Empire itself eventually grew weaker.
Theodosius I was the emperor who made Christianity the official religion of the Roman empire.Theodosius I was the emperor who made Christianity the official religion of the Roman empire.Theodosius I was the emperor who made Christianity the official religion of the Roman empire.Theodosius I was the emperor who made Christianity the official religion of the Roman empire.Theodosius I was the emperor who made Christianity the official religion of the Roman empire.Theodosius I was the emperor who made Christianity the official religion of the Roman empire.Theodosius I was the emperor who made Christianity the official religion of the Roman empire.Theodosius I was the emperor who made Christianity the official religion of the Roman empire.Theodosius I was the emperor who made Christianity the official religion of the Roman empire.
Religio Laici was created in 1682.
Religio Medici was created in 1643.
Nova Religio was created in 1997.
Religion is belief followed by a person or a group. Example Christianity, Hinduism, Buddhism etc.
There are two religio-political systems: Organic and church.
When Christianity became the official state religion, other religions began to decline.
After the Edict of Milan in 313 AD, Christianity became an official religion along with all the others. Note that in 313 it was an official religion, it was not the official religion until 380 AD.
on Feburary 27th, 380 they made Nicene Christianity the official Christian religion of Rome, however it is unclear whether this was intended to apply to pagans.