While the Jewish system of sacrifice was highly formal and could only be done if a tabernacle or temple was available, there are cases in the Bible where non-Jews appear to give animal sacrifices, such as Abel and Job. It even states that God accepted Abel’s sacrifice, and infamously did not accept his brother Cain’s.
Does God still accept animal sacrifices today, at least in theory? Could a Catholic today choose to perform an animal sacrifice in lieu of a typically performed sacrament? For example, could a Catholic in mortal sin be forgiven of that sin by sacrificing a ram on an altar instead of going to confession? Can you make an animal sacrifice instead of going to Sunday mass? Can one receive indulgences by making animal sacrifices? Would this be permitted for Jewish Christians, but not Gentile Christians?