Faith in God was not for the squeamish.

Then he slaughtered the Whole-Burnt-Offering. Aaron’s sons handed him the blood and he threw it against each side of the Altar. They handed him the pieces and the head and he burned these on the Altar. He washed the entrails and the legs and burned them on top of the Whole-Burnt-Offering on the Altar.

What makes this ritual bloodshed more remarkable is the idea that the sacrifices were of animals that he was hand-raised from birth. These were known, and possibly even named, animals. Atonement then was a personal, bloody, elaborate process. A fitting parallel to the atonement we rely on now.