1) If the shedding of blood is a must requirement for the forgiveness of sins, how come Jesus forgave people their sins as he went about preaching and teaching - before he was crucified?
2) What is justice? Is it justice to punish an innocent man for the crime, sins and misdeeds of guilty offenders?
You are saved by grace through faith - faith that God is your Father and you are His child and faith in His power to keep you securely all through eternity. It is this same faith that saved Abraham, Moses, Elijah, Peter, Mary, Paul, etc. The technique of salvation has never changed. It's the same anywhere and anytime.