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human
In the time before Christ, animals were sacrificed (killed) to atone for sins. Sacrificing a prized possession was a way to show that you're sorry for what you did. Then, according to the gospels, Jesus sacrificed himself as a final sacrifice; animals no longer have to be sacrificed to pay for your sins, because they have been paid for 'by the blood of Jesus.'
There are 5 differences between the animal sacrifices and Jesus's sacrifice:
1. The animal sacrifices did not come back to life. What was actually lost, since Christ came back to life?
2. The animal sacrifices were not retroactive. They were atonement for past sin, whereas Jesus's sacrifice paid for both past and future sins.
3. Animals didn't choose to be sacrificed, the owners chose for them. Meanwhile, Jesus willingly participated.
4. People sacrificed that which they valued. Jesus was not valued by the ones who killed him. God was the one who valued him, just like humans valued their animals. Also, who was he sacrificed to?
5. People who killed Jesus did not intend for it to be a sacrifice. 
Conclusion: sacrificing Jesus would not be a valid way for humans to atone, but a way for God to atone by sacrificing to us.
Analogy: You're living in a time before Christ. You are going to sin in the near future, so a goat that does not even belong to you seeks out a pack of wolves of its own volition, and the wolves kill it. Then, the goat comes back to life and returns to safety. Years later, someone tells you about the goat that sacrificed itself on your behalf. And if you believe and accept that story, the debt for your sin would be paid.
(credit to darkmatter2525)
gpt
>Christ called himself a High Priest in the order of Melchizedek
>priests offer sacrifices on behalf of their people and themselves
>Christ was the High Priest offering sacs on behalf of the world, but not himself
>High Priest and the Sacrifice
>Like Isaac, who carried the wood up the mountain to his own sacrifice
>Christ carried the cross up the mountain to his sacrifice
>God provides the ram to Abraham
>God provides the sacrifice
human
Then it's no sacrifice at all!!!