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In which language was the Orthodox Church service? Greek, Russian, Italian, or language of the people

Why did the Orthodox Church invent alphabets?
to read the Bible
to confuse the Catholics
to find a new religion
to teach in the language of the people

How did Russia become primarily Orthodox?
through a revolution
the church wanted to teach the people
adopted by the government
by ridding the country of the Catholics

What caused the start of the Orthodox Church?
exile of the patriarch
execution of the patriarch
excommunication of the patriarch
eviction of the patriarch