Letters to the Editor
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Nobody expects the Inquisition
The Inquistion did not involve Catholics killing Protestants... because the Protestant Reformation hadn't occured yet, thus, there were no "Protestants.
Oh, honey, it totally did involve Catholics killing Protestants! They just called them Heretics until there were enough of them to command large armies. The Inquisition was in fact invented to wipe out the Albigensian and Waldensian Christian heretics in the early 13th century, because they stood for, amongst other wacky things, being able to read the Bible for themselves.
Then later on it became effectively the Christianizing arm of the Spanish Crown and went after Jews and Witches and Muslims and Christian converts who weren't maybe converted *enough* for the their taste.

