In this world, the late Roman penetration of Christianity into the German lands would lead to a reaction, in the form of a Mohammed-like figure, who in the story as it would be told would take a walk at night in a holy grove, and be overcome with visions. Syncretizing Christianity with various elements of Germanic belief, this monotheistic-with-some-frills religion would be an expansionist one, claiming to be an original truth than Christians and Jews had forgotten and would have to be reminded of, by the sword if necessary. So when the Germanic invasions got underway, it would be a religious crusade as well as a territorial migration...