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Russia's religion in the Middle Ages was Christianity.
Christianity is the religion with three major denominations: Catholic, Orthodox and Protestant. In each of these, there are literally thousands of sects.
It was Orthodox Christianity.
The two main religions in Serbia are Orthdox Christianity around 80% of Serbian population, other 2 main religions are Islam and Catholic Christianity.
Orthodox Christianity
Orthodox ChristianityTheir main religion is Orthodox Christianity.
Christianity was the religion of Constantinople. The formed the Eastern Orthodox Church, attended it regularly, and had icons inside their house.
Christianity and Islam are the most common religions in Ethiopia, but there might be some Jewish people too. Christianity has been in Ethiopia longer than Islam.
Eastern Orthodox is a branch of Christianity.
The most common religion in Estonia is Evangelical Lutheranism. Orthodox Christianity is the second most common. There is a minority of Roman Catholics.
The largest and main religion in Russia is Orthodox Christianity. However, there are also some smaller groups of other Christians, Muslims, Jews and atheists.
Christianity is the main religion (mostly Orthodox) followed by Islam. Buddhism comes a long way behind as the third religion. In between the two main religions are a significant number of non-religious people.