If the division for eternity [between Heaven and Hell] is all about accepting Jesus and nothing about how you behave, it is a silly and arbitrary division indeed, was the challenge. So, what is the division?
There is not one Christian view. Origen, a theologian from the third century, believed in apocatastasis, the idea that that which God creates, returns to God. This was declared heretical in 553AD, but some accept it now. My former vicar said that he believed Hell existed but no-one actually went there.
The division being about accepting Jesus makes great sense in a personal context. I have heard of Jesus. The gospel is that I cannot be good on my own efforts- which fits reality, I make mistakes all the time- but that Jesus reconciles me to God by his sacrifice. There is forgiveness if I only believe in it. To me, that makes good psychological sense: I keep trying. Despite all my past failures, what matters now is what I do today.
Antinomians, such as extreme Calvinists in 17th century Scotland, said if one is predestined to Heaven or Hell, there is no point in behaving morally.
Why divide by belief? Belief is enough. I am accepted by God the parent. We hope this belief will change the person: loved, we respond with love, for God and others.
The division makes far less sense in a world context. The child of Chinese Communist Party members may have heard of Jesus, has not got the excuse of ignorance, and yet has grown up knowing that Christianity is ridiculous. He never enters a church. Yet, if he lives well, why should he go to Hell? One could multiply examples. The man who joins a gang, because it is the only way to be safe, and is ordered to do vile things, may be living as well as is possible in his circumstances. 2.3 billion Christians, now, means 4.7 billion non-Christians, and the idea of them all going to Hell is repellent.
Christians usually answer this by saying judgment is between God and God’s creature, and not up to the speaker. Romans 1:20 speaks of people being aware of the reality of God from their experience of creation: For since the creation of the world God’s invisible qualities – his eternal power and divine nature – have been clearly seen, being understood from what has been made, so that people are without excuse. This applies at least to those Paul saw worshipping idols. Despite that, we are squeamish about Hell- though not all of us, and in the past there has been enthusiastic damning of the Outsider.
The Reformation rejected the former idea of Purgatory, perhaps because the sale of indulgences. Someone not bad enough to be damned went to Purgatory (of which the flame is roses, and the smoke is briars) for a time, and the church sold time off. 1 Corinthians 3:10-15 gives a scriptural basis for this; but I think Protestants believe those the Catholics destine for Purgatory get straight to Heaven. The Catholics do not sell indulgences now, but claim they can be gained by Freely abstaining in a spirit of penance from something licit and pleasant. So they encourage asceticism.
Limbo is not an official doctrine of any church, but the idea that at the edge of Hell there is a place for those who lived well but did not have the chance to turn to Christ: Dante places Virgil there. There is no punishment other than separation from God.
My answer, which is a strain within Christianity, is that damnation is between God and each person, and that I can only apply any threat of it to myself and to no other person; but I follow Origen. There is no eternal separation from God.