The best replacement for luther is calvin.

The best alternatives to luther are rated as following:
★★★★★  calvin
★★★  erasmus
★★★  borden
★★★  zwingli
★★★  catholic church
★★  john calvin
★  sherlock
★  felix
★  martin luther king
  muntzer
  wesley
  john wesley
  malcolm x
  charles v
  martin luther king jr
  big luther
  melanchthon
  eck
  machiavelli
  martin

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Speaking about luther, one probably shouldn't forget about indulgences.

Other search terms related to luther and their ratings are:
★★★★★ indulgences
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