How did Christianity become the most popular religion on Earth?

A video on YouTube. In History, a Krater category.

Summary by Krater

This video traces the global history and spread of Christianity from its origins in Roman Judaea in the first century AD to its status as a global religion, covering major milestones such as the conversion of the Roman Empire, the Great Schism, the Crusades, and modern missionary movements.

From the video

Answers: How did Christianity spread around the world throughout history?

History of Christianity
Spread of Christianity
Roman Empire
Christian missions
Church history

What it concludes

Christianity is the most practiced religion on earth.
By 100 AD, the four gospels that make up the Bible's New Testament are complete.
In 380 AD, Emperor Theodosius passes the first Roman law to define orthodox Christian belief, making Christianity the state religion of the Roman Empire.
By 1914, European nations claimed 90% of the African continent, bringing Christianity with them.
Today there are 2.3 billion Christians, representing nearly a third of the world's population.

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