How many people did the Catholic church kill during the Spanish Inquisitions?

It seems that Muslims are always blamed for being the most violent of the religious sects but isn't it true that the Catholic church ordered inquisitions throughout Europe, Russia, etc. The Cathloic church also aided in some of the destructions to the Aztecs and Incas in Mexico, Central America and south America. Which religious group has killed more over the last 1000 years? How many total killed were there during the spanish inquisitions?