But, the old covenant sacrifices did have a purpose. They foreshadowed Christ's sacrifice, as
Hebrews 10 indicates. So, they already served their purpose. What purpose would future animal sacrifices serve and what evidence do you have to support your answer?
While Paul refers to the sacrifices as a shadow of good things to come, he does not argue that foreshadowing the sacrifice of Christ was their purpose. But let me grant you this for the sake of discussion.
I believe we can both agree on the fact that God used the Romans to put an end to the offerings during the Jewish/Roman wars of 70AD. Both the Jewish rebels and the Roman armies destroyed the temple. And if history were to end at the Second Advent, then we would not witness animal sacrifices again. Bear in mind, though, there is nothing in the Bible that says this explicitly.
The future absence of animal sacrifices is a logical inference from Amillennial doctrine, not explicitly taught in scripture. Amillennialism teaches that history ends when Jesus returns, and if history ends when Jesus returns, then logically one can conclude that God will not re-institute the sacrifices. If history ended today, Amillennialism would be proven correct.
But history hasn't ended, and the Bible doesn't explicitly say that God is done with animal sacrifices. Granting your premise, then, the original purpose of the sacrifices has passed and they are no longer needed. Bear in mind, apart from the God instituted legal system, which were the terms of the original covenant, sacrificing an animal is not a moral imperative as such. Offering an animal sacrifice is a moral imperative only in so far as they were commanded by God as part of the original covenant. While sacrificing an animal is not morally obligatory, obedience to God IS morally obligatory. So if God commands it, one must obey it.
The original covenant is no longer in effect, and as the Lord, through Jeremiah says, "a covenant which they broke." For this reason, I would never suggest that animal sacrifices will be offered on the basis of the original purpose. The atonement of the cross is better and more permanent than the Levitical atonement offering. Therefore, if animal sacrifices are re-instituted, they will not serve the original purpose. They will serve an entirely new purpose.
Any new purpose can only be understood from within the context of God's wish to vindicate his holy name. Accordingly, we understand how God intends to prove himself among the nations from within the broader context of his relationship with his people. Yahweh took a people for himself from among the descendants of Jacob, and brough them out of Egypt. Jeremiah 31:32 They were to be a people for Yahweh and he was to be a God to them. As I explained at great length
here and
here, his people failed to be a people to him.
In order to vindicate his name, God intends to bring his people back to the land of their fathers, cause them to keep his commandments, circumcise their hearts, protect them from their enemies, bless them materially and etc. Where his people were disobedient, they will now obey; where their hearts were stubborn, their hearts will be honest and contrite; where they attempted to please him with the wrong attitude, they will have the right attitude; where they relied on works alone, they will add faith to works. Bottom line, in the way God intended for them to be a people for him; they will be a people for him. And in the precise way that he intended to be a God for them, he will be a God for them. And all of this takes place during a time in history when the Gentile nations can watch. History won't end until God sanctifies his name.
Where is this taught in scripture, though? It seems like you're just making this up, which means it can just be easily discounted and not taken seriously.
Well, frankly, it is taught all throughout scripture. Begin with the Lord's prayer, "Our father in heaven, make your name holy . . ." and search for texts which indicate when and how God intends to answer our prayer.
None of what you're saying is coming from scripture as far as the idea of future animal sacrifices being offered is concerned. You're making things up to support your doctrine. Do you really think anyone should take this seriously when your view of future animal sacrifices and the purpose for them is clearly coming from your own imagination rather than from scripture?
What saddens me, a bit, is how much Amillennialism has clouded the vast amount of texts, which deal with this very subject. I hope you understand that no one, not even Jesus, can prove something to someone who doesn't want to be shown the truth. Just sayin'