Jesus was a revolutionary apocalyptic zealot who was crucified for his crimes against the state. His death was not a "sacrifice".
In this post, I want to examine some things that Jesus said and did within the wider context of 1st century Jewish culture.
1) During the first century AD, the Jews were looking for someone who could free them from Roman rule. The Jews were not looking for someone who would "die for their sins."
2) Many of the things that Jesus said and did only make sense within the context that Jesus taught that God was going to establish a kingdom on Earth within the lifetime of the disciples. Indeed, Jesus said:
"For the Son of Man will come with his angels in the glory of his Father and will judge all people according to their deeds. And I tell you the truth, some standing here right now will not die before they see the Son of Man coming in his Kingdom.” -Matt. 16:27-28
"If anyone is ashamed of me and my message, the Son of Man will be ashamed of that person when he returns in his glory and in the glory of the Father and the holy angels. I tell you the truth, some standing here right now will not die before they see the Kingdom of God.” -Luke 9:26-27
If anyone is ashamed of me and my message in these adulterous and sinful days, the Son of Man will be ashamed of that person when he returns in the glory of his Father with the holy angels. And He said to them, “Assuredly, I say to you that there are some standing here who will not taste death till they see the kingdom of God present with power.”' - Mark 8:38 -9:1.
3) Jesus's teaching of an imminent "Kingdom of God" presented a threat to the ruling Romans. Additionally, Jesus was viewed as insurrectionist because he caused a riot in the temple (Matt. 21:12-13).
With these things in mind, it makes sense why the Romans crucified Jesus—they viewed Jesus as an enemy of the state. Indeed, the punishment of crucifixion was reserved for enemies of the state, pirates, and treason.
Additionally, when Jesus was crucified, above his head was written, "this is jesus, the king of the jews." (Matthew 27:37)
This makes it clear that the Romans considered Jesus to be an insurrectionist who was a threat to the Roman state, leading to his execution.
4) There was nothing "sacrificial" about Jesus's death. Jesus was a criminal according to the Roman laws, and he was a blasphemer according to the Pharisees. Jesus was killed for his own crimes.
5) Nowhere in the 4 gospels does it say that Jesus would die for people's sins. Substitutionary atonement is not found in the gospels. Jesus does say that he would die and rise from the dead, but he does not say that his death would be a payment for humanity's sins.
The concept of substitutionary atonement is developed in Romans 6-7, not in the gospels.
6) The gospels and Paul's letters contradict each other. Jesus said that nothing would disappear from the law. But, Paul says:
6.1 substitutionary atonement, in Romans 6-7
6.2 Christians are under grace, not the law, in Romans 6:14, Galatians 5:4
6.3 Jesus fulfilled the law, Romans 10:4
These 3 concepts contradict the law in the OT. The concept of substitutionary atonement did not exist in Jewish culture. (This is one of the main reasons that Jews rejected Christianity).