I shouldn't have responded, but there is a line between killing oftentimes innocent people, oftentimes brutally, as part of a religious ritual and killing convicted criminals in a relatively timely manner. It helps that Christendom treated executions as a dirty and somber business that needed to be done to ensure justice on earth, in comparison to the glorification of human sacrifice and the priests doing it as seen in the Aztecs for instance.
Also, the fact that societies where human sacrifice was common oftentimes were aggressive in order to obtain prisoners to sacrifice is another reason why it is incomparable to the execution of individual criminals.