Control might be a wrong word. Reform. And there is the possibility that Jesus never existed.
It's a belief. What would you do if someone came up to you and demanded you should stop all your beliefs/customs/ceremonies etc. and convert to their religion? Would you give up lightly? I think not. The Vikings showed incredibly fierce resistance. And whenever the Christians found any pagan temple, they killed all the inhabitants and any people nearby. Then they would place a big stone cross on it.
These are Vikings we are talking about. They don't give up easily.
Ignore that part. That was accidental.
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