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If during the battle of milvian instead of the vision of the burning cross, Constantine saw a vision of Appolo and decided it was through devotion to the old gods that he was victorious and from there set-forth to reestablish the Roman pantheon as the absolute religion of Rome.
Some people take the cynical view that Constantine took a political move to align with the rising Christian movement. However at that time its estimated Christians were less than 10% of the Empire it was far from certain Christianity without Constantine would have become the dominant religion of Rome.