the exact number of deaths and the exact extent of torture is pretty irrelevant to the climate of fear that the inquisition created. If the government and church announce that they are setting up tribunals to find heretics and kill even one person a year, people who are born into heresy (by being Jews or Muslims or women of any ethnicity) are going to live in fear.
A clarification: the Inquisition had no
authority over non-Christians. A purpose of the Expulsion was to ensure that every Jew remaining in Spain was in fact baptized and subject to the Inquisition thereafter. I've heard that how the Expulsion was implemented varied from area to area and case to case: Some were able to leave with property or money, some weren't. Some were not allowed to leave at all, but given the choice of conversion or death. Some were forcibly baptized with no such choice. Some were allowed to leave, but not with their children :(