I don't think it was ever the blood of cattle that gave atonement, it was the blood of Christ. We are told that is the only way of salvation and yet we are told in Matthew that the OT saints walked the streets of Jerusalem at the physical death of Jesus. If you study the sacrificial system, they were to give up their sins so they could be saved, and the Lord told us he gave life blood for our souls and it was a requirement for salvation. I have studied that system and it is the same system we have in Christ, only explained more thoroughly giving all the sins that Christ saves us from.I think about that because the "mechesiam" of forgiveness of sin bulls and goats has passed away with the sacrifice of Messiah of the Spotless Lamb of God on the cross.... Messiah/Jesus.... it was fulfilled not passed away.... not one yod....
But does not the New Testament say be holy because God is holy? what do you measure your holiness? The NT days to not add or take away from the Word of God.... Which Books are God breathed? Has we will lay down our plow shares and neighbor does not have to teach neighbor because everyone is full of the knowledge of God fulfilled yet? does the lion lay down with the lamb?
God tells us we can't be holy on our own, but the NT is clear, even after John the Baptist that we are to repent. Christ wipes out our sin and it as if we become righteous through Christ. But if we still want sin in our life, I think God lets us choose that. When we repent and don't want the sin we are given help to actually partially attain that. It seems to me that people who give themselves completely to the Lord have a peaceful shining look you can actually see in them.