Generally speaking, Christian influence is to blame. Rome originally persecuted Christians, but after emperor Constantine converted to Christianity, Rome quickly became a monotheistic society. As religious tolerance wasn’t huge back then, it didn’t take long for Rome to start persecuting “old gods” instead, including the Greek and Roman gods. As Rome spread across Europe, so too did Christianity, making its way into England, France, and even Norway (Normandy is interesting reading, by the way). Missionaries converted those who were willing, and societal pressure persecuted those who weren’t, until eventually almost everyone was Christian.
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