1) "You are suggesting that Satan demanded someone must suffer torment, and Jesus suffered in order to satisfy Satan's requirement? We would reject that as well. Satan has no right to demand anything. God owes him nothing. Neither do we. Frankly, that idea (I don't know if you're suggesting it?) is an affront to the dignity of God on some levels. I'm not saying this to pick a fight - not at all (and please forgive me if it sounds so - I know of no softer way to state how we would respond to that idea). But Satan is a created being, as are human beings, and neither he nor we are in a position to demand anything of God.
I might reiterate here that God is not subject to any arbitrary cosmic laws. He is true to His own nature, not because He is constrained, but because - He Is Who He Is. And if whatever theories we might develop don't mesh with that, we must conclude that our theories are wrong. We cannot - must not - attempt to understand God though our lens"
2) Here's a question ... if Christ's death had been quick and painless, do you suppose it would have been sufficient? If not, why not?
3) And as a follow-up ... what sacrificial animals in the shadows of the OT sacrificial system were tortured and made to suffer before being killed?
1) You say, "Satan has no right to demand anything." What is your validation for this statement? This is a very broad statement that requires support if it is going to be the basis for an argument!
Your statement is the idea I've seen attributed to Anselm of Canterbury, and I find it baseless. It has been accepted for the last ~1,000 years, but it has no scholarly merit. The entire Bible portrays Satan as having power and being a serious enemy. Yet this seemingly clear narrative is rejected with the pre-supposition, "Satan is a rebel, a created being, and therefore has no power over God."
There are probably 20 interconnected arguments required to demonstrate my position, but that is too tedious for the average attention span of the typical forum user. So instead of arguing, I will explain the sequence of events as I see them reflected by various Biblical stories.
Before the book of Genesis begins, God was the ruler of heaven. And God claimed to be a righteous king, arbitrating perfect justice and truth. God claims to know absolutely what is good and what is evil; God says he deserve to be rule over the angels because of his attributes. God says truth defines who he is, rather than the more devious, "Whatever I say is truth" that is typical of a dictator.
Satan is credited as being "The father of lies", and he doubted God's claim. Satan's lie is what we read in Genesis, "You can be like God, knowing good and evil." This lie undermines God's claim to the throne. If Satan and all the angels believe they are capable of knowing/ deciding what is good and evil for themselves, they are condescending God. They are saying, "We know better," or "We know differently", but either way they are saying that God's claim of truth and justice is arbitrary. And if God imposes an arbitrarily defined set of rules on the angels, God would be a controlling dictator and a tyrant, instead of being the just, noble, and benevolent king God claims to be.
This is the lie that spread through heaven, and 1/3 the angels believed it. This is a very dangerous lie, and it put God in a bad situation. How is he going to re-unite his kingdom? How is he going to deal with the traitor Satan?
The problem is easy to understand. If Satan is accusing God of being a tyrant, and God responds by destroying him, God's action confirms the lie, making Satan a myrtr. When the angels see it, they will reject God and deny his authority, which destroy's the kingdom. And once this happens, there is no way for God to restore his kingdom without using force--this would make God an actual tyrant.
If God knows what's on Satan's mind and makes Satan disappear before the lie can be spread, Satan's absence will be noticed. When Satan's plight is discovered, God will be required to give an explanation for what happened. And what will God say? "Satan was going to tell a lie that was going cause all sorts of problems, so nipped it in the bud to protect our peaceful existence." But the problem with this is that God's foreknowledge, assuming God has such an ability in the heavenly realm, is not proof. There are plenty of Sci-Fi movies making this same point--arresting someone for a crime that hasn't been committed yet is hugely problematic. Even if it is true, it is easy to suspect it is arbitrary and an abuse of power. So again, God would turn into a tyrant in his attempt to suppress Satan's lie.
So what did God do? God created the opportunity for Satan to test his theory in clear view of all the angels; God created us and all the living creatures on the earth. Satan and all the fallen angels were cast down to earth, where they are free to do whatever they want. God did this so all the angels could see for themselves how wrong Satan is. And when all of Satan's attempts have ended in failure, God will condemn Satan for his true crime, which is sabotaging heaven! And when this happens, all of heaven will celebrate God's wisdom, justice. God's kingdom will be restored.
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In Genesis, we see God and Satan visiting Adam and Eve, and there is a choice to be made. The two trees symbolize a choice, and Adam and Eve choose Satan's tree. What does this mean? Satan's tree symbolizes Satan's lie, and eating the fruit is to accept Satan's lie. (I said it is functionally the same as the modern act of signing a contract.) Adam and Eve rejected God, choosing Satan instead of God.
Once Adam and Eve choose to follow Satan, they are under Satan's authority. And because of all the arguments above, God can't "just" take us away from Satan on his whim. Why? Because this would be interference! God has given Satan complete freedom and authority, and if God were to revoke that freedom or interfere in Satan's plans, then that would invalidate the outcome. That's the last thing that God wants.
So instead, God honors the rules he created. This means that God is negotiating with Satan, as we see in the story of Job.
God says, "I want to redeem the people who desire to follow me." Satan says, "If you really want them back, you'll have to do something for me." And being Satan, he makes the most cruel demand imaginable. Why? Because he is testing God. He likely believes that God does not love enough to sacrifice, and he would very much like to reveal such a limitation. But even if God does go through with it, Satan has still humiliated Jesus, which is almost as good in his mind. He doesn't do this because he values people; he does it because his control of us gives him leverage!
Anyway, this is a brief explanation of the backstory that explains everything that his happening on heaven and earth.
2) If Jesus death had been quick and painless? It wouldn't have satisfied Satan's demand...but that doesn't help explain until we understand what Satan's demand was.
The skeptics are right that Jesus' death is anti-climatic, and his death is easily seen as the death of the Jewish hope. Jesus inspired the people to hope, and then that hope was torn away. Jesus fulfilled the prophecies, and then died without doing any of the things they fervently hoped for. Only a fool would say this is not a recipe for deep disappointment!
I think we're being short sighted when we assume that Jesus' physical death was all that happened. Jesus' sacrifice to save us was carried out in a way that crushed the hope of the people who were looking for salvation! It is the kind of disappointment that could destroy a religion; I don't think this was at all an accident! Satan would likely say to Jesus, "What good is your salvation if nobody believes in you?"
3) What sacrificial animals were tortured and killed? This is a badly formed question! It's a confusing mess of contradicting presuppositions, and I feel confident you would not agree with with them if they were all unraveled!
Let me substitute a different question that is far more helpful. Why didn't God make Abraham go through with sacrificing Isaac?
Kierkegaard spends a lot of time focusing on how Abraham could have been willing to sacrifice his son, but I think he overlooked this more compelling question: "Why would God stop Abraham when he was about to complete the request?"
I think the answer is simple; God didn't want Abraham to live with the consequences of the action! And even if Isaac were to be raised from the dead, to further the prophetic nature of the event, how could Isaac live with the knowledge that his father was willing to kill him, and had actually done so? Psychologically this would be horrible!
Kierkegaard wanted to know how someone could do something like this out of faith, and his confused reasoning only demonstrates his lack of experience with faith! It is easy to act in faith, but it is much more difficult to live with the consequences. Doubt is viscious; waking to nightmares of killing his son; that would have ruined him!
Later in the history of the Jews, they used animal sacrifices as a reminder. Animal sacrifice is a much less traumatic than a father killing his son. And why no torture? God didn't want them to play the role of vicious executioner! If they strung up a lamb and tortured it, they would be acting out Satan's fantasy, rather than remembering God's promise.
I think the takeaway is that God wants to lay the foundation for understanding what happened, but God doesn't want us to do it in a way that causes psychological trauma to ourselves.