Why the Reformation was first in Germany Know

This question is the same as why Shang Yang was able to change the law y in Qin during the Warring States period. Germany is different from France and Italy, etc. Germany is similar to Qin, in the Roman period belongs to the land of foreign barbarians, so it has not been honestly obeyed by Rome, their ideas are most active, not be bound. So it is easy to change.