Besides...rather mercy than sacrifice...
But the lesson failed and now no need for continuing something that was symbolic anyway...
You ascribing actual power to the blood itself is idolatry...it was only a symbol and sign of obedience and faithfulness and as an act this action or work was pleasing to the One Who atones...
The blood itself remains blood nothing more...
Even circumcision is merely a sign and no guarantee of salvation...never was
Giving power to images/symbols/signs is idolatry...
God said it, not me.
Leviticus 4:20
And he shall do with the bullock as he did with the bullock for a sin offering, so shall he do with this: and the priest shall make an atonement for them, and it shall be forgiven them.
Leviticus 5:6
and he shall bring his trespass offering unto the Lord for his sin which he hath sinned, a female from the flock, a lamb or a kid of the goats, for a sin offering; and the priest shall make an atonement for him concerning his sin.
Leviticus 16:27
And the bullock for the sin offering, and the goat for the sin offering, whose blood was brought in to make atonement in the holy place, shall one carry forth without the camp; and they shall burn in the fire their skins, and their flesh, and their dung.
Leviticus 16:30
for on that day shall the priest make an atonement for you, to cleanse you, that ye may be clean from all your sins before the Lord.
Numbers 15
25 And the priest shall make an atonement for all the congregation of the children of Israel, and it shall be forgiven them; for it is ignorance: and they shall bring their offering, a sacrifice made by fire unto the Lord, and their sin offering before the Lord, for their ignorance: 26 and it shall be forgiven all the congregation of the children of Israel, and the stranger that sojourneth among them; seeing all the people were in ignorance.