A complete and utter falsehood. I suggest you read a book on the history of the Inquistion by Henry Charles Lea, a Protestant who was quite biased against the Catholic Church. He conservatively estimates the number killed by the Inquisition as being a few thousand over a four hundred year period, hardly "tens of thousands" or the absurd claim of "100 Million" that Catholic baiters make.
I'm sure the Protestants in Europe, Great Britian and in the Salem Mass. area put just as many people to death as sinful members of the Catholic Church did.
I agree with you on this one. The Catholic church almost certainly killed more, but the numbers are close enough.