"Technically, you could smear Christian theology with such loose and egregious examples"
Describing a practice of some Christians 500 years ago is not smearing Christian theology. That some Christians did such things is merely a comparison with similar things done by followers of other religions. It is not a value judgment of either.
I am not smearing Christianity. I am merely describing one aspect of it in history.
Please elucidate Christ's teachings on self mutilation for me.