What would happen to Christians, that aren’t Catholics or mainstream Protestants, and instead have entire separate beliefs? Would they be persecuted because they’re not considered Christian/Atheist, or entirely because of how they respected the regime? Like what happened to Quakers, Amish/Mennonites, Unitarian-Universalists, or Mormons?
/u/commiespaceinvader has previously answered Why did the Nazis target Jehovah's Witnesses? Are there any accounts of the concentration camps from the perspective of a Jehovah's Witness?