The God of Christianity is regarded as all-merciful and is touted as being slow to anger but fast to forgive. Why then is the punishment for eighty years of misdeeds an eternity in eternal suffering? Even the US government would not be so harsh- protection against cruel and unusual punishment. Why then is God? It should stand to reason that Hell would be some kind of final redeemer, where the amount of time spent there is equivalent to the amount of time it takes one to repent truly, ie, the ultimate tool for redemption. People face unimaginable pain and torture until they realize their sins. And once they realize their wrongs, would a true God of compassion who cares for all of his creation leave them to continue to suffer?
You're talking about "ultimate reconciliation" which, unfortunately, isn't a biblical doctrine. Death and hell are literal consequences for man's sinful nature and actions. God is just. He gave man a choice in the very beginning. He laid out in simple terms what was necessary for eternal life and what would happen if man disobeyed Him. Man chose the latter. So mankind was doomed to certain death until God took mercy upon him and gave him a way out. He took on a flesh body and died in our stead thus paying the penalty for sins.
So the door is open to anyone who desires eternal life in the Kingdom of God. That door is Jesus Christ. Accept Him and claim entrance or deny/reject Him and suffer the consequences. This truly is a life or death decision.
I get that the bible says that God is just over and over, but if that's the case, then what is justice?
Your first premise here is that God gave "man" a choice in the beginning and "man" chose a sinful nature, thus death and hell are the consequences for mankind. What you are stating is that an entire species is being punished up to and including the potential for eternal torture beyond imagining, for the actions of the first man, i.e. actions that nobody else among the species, other than Eve, had any chance of preventing.
The implication you're making here is that justice includes punishing people for the actions of others over which they had -no- influence. Justice includes punishing someone for the actions of someone else, if we are to believe that the biblical God is the template for justice.
So the question must be asked: Is our idea of justice skewed? Is true justice the punishment of everyone for every transgression of anyone?
More to the point of the OP, however, the question of eternal punishment must be considered. The only reasoning you've offered for why eternal punishment is the norm is that God said we either obey him or we pay the consequences. The implication this time is that hell is a just punishment because it was included in God's this-or-that. Essentially, I must assume by your reasoning that if a figure of authority includes a punishment in his ultimatum, then that punishment is automatically a just one.
What you're saying, essentially, is that the guy with the gun is the guy who decides the nature of justice. Shall I assume this to be your view on the concept?
If that's not the case, then why is an eternity of torture a just punishment for not figuring out who the real God is?