Did the number of Christians increase or decrease between 325 CE and 476 CE How do you know?

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It was increasing

Explanation:

At the time the Western Roman Empire fell in 476 CE. In the decades after Jesus's death, the Apostle Paul wrote many letters that are now part of the New Testament of the Christian Bible. Paul was a Roman citizen and sent these letters to small communities of Christians living throughout the Roman Empire. The letters show us that Paul and his fellow Christians were still figuring out exactly what being a Christian meant. Issues related to the exact relationship between Judaism and Christianity, and between Christianity and the Roman government, were prominent topics of discussion.