Eastern Orthodox, although there is a significant catholic minority as well.
All these countries are Eastern Orthodox.
eastern orthodox
There is a significant Muslim population, and the Serbs there would be followers of the Russian Orthodox branch of Christianity.
An organized branch of Christianity is called denomination.
No it is a branch of paganism
Orthodox Christianity (Pravoslavianska Viara)
Mormon
In the 1500s, the majority of people belonged to the Catholic branch of Christianity in Europe. This was a time when the Catholic Church held significant power and influence over religious practices and beliefs in many parts of the world.
Methodist is a branch of the Protestant religion. That is a branch of Christianity.
Eastern Orthodox Christianity is considered the traditional and official religion in Bulgaria, although a big part of Bulgarians consider themselves atheists.
Protestantism
Catholic