The number of deaths is estimated to be in the very low thousands.
The Inquisition is certainly a black spot; biblical Christianity, from a human standpoint, tells people to come freely to Christ, not be forced to profess Christ because of threats. But the Inquisition also must be put into perspective, both compared with the numbers and the culture of the time.
Spanish Inquisition (1478–1834): historians such as Henry Kamen estimate between 1,500 and 4,000 people were executed for heresy,[SUP]8[/SUP] out of Spain’s 6–10 million total population. So at most 0.05% of Spain’s population was killed. While this is nevertheless deplorable, it means that the Inquisition’s rate of executing people was lower than that of the state of Texas today, while atheist Stalin often killed that many before breakfast (so to speak). Furthermore, Inquisition trials were often fairer and more lenient than their secular counterparts—indeed, some criminals uttered heresies precisely so they would be transferred to the Inquisition courts.
The source for this paragraph is an excellent, little article concerning Christianity and its atrocities. The atrocities are deplorable, but the numbers we often hear have been skewed greatly by atheists. Here's the truth.
Between 1,500 and 4,000 people were executed for heresy in a 356 year period.
Source:
Bad things by church - creation.com