I'll try this. At the beginning of the Bible: Burnt offerings were asked by God for Thanksgiving and sorrow for sin and such. Then when Christ came, the scriptures from the beginning of the bible til Christs coming pointed to the need to remove sin, forgiveness of sin and when Christ died, it was His Precious Blood, which is in all the sacraments. He gave a command to the Apostles, "What sins you forgive they are forgiven and what sins are not, they are not." Man has a need to go through the words, actions, conscious and such to know that sin is forgiven BUT, to receive the Precious Blood!! Who would not want His Blood!! His Blood is saving. HOw many sects like the Aztec's saw blood sacrifice as important, only they were in error as we know. There is research to do. The Aztec's from what I read somewhere, that the Aztec's were once Catholic. Who ever did the research, showed evidence that they had confession as well as Catholic symbols on tombs or such. Very interesting and if so, that should be an eye opener to us all of what error can do! Thank God that Our Lady made herself known to the Aztec's! It was the biggest conversion that ever happened on the Planet Earth!