The reason judgement exists is that God won't accept evil forever. We wouldn't even want him to, I don't think. We don't want eternal life to include abuse, war, etc. The core meaning of judgement is rejecting evil.
Now, the question is, to what extent does rejecting evil involve rejecting evil people. On that there are a number of Christian ideas. Which of those ideas you're willing to talk about depends upon how conservative or liberal you are. The traditional Western view (for which there is certainly Scriptural support) is that if you reject God in a definitive way he won't save you. Possibly won't be able to save you. Someone who really refuses to submit to God might find a forced relationship with him intolerable.
Everyone agrees that the fiery pit is a symbol. But what it's a symbol of still isn't very nice. Since God is the source of life, final separation from him isn't going to leave any kind of life we'd want to live. Perhaps it's the best God can do for people who reject him. However I will say that the traditional Western view is that anyone who doesn't have faith in God deserves anything that they get. Including eternal torture.
Note: while many Christians believe that anyone without faith in Christ will be rejected, there is an alternative that I believe is still considered orthodox. It's called "inclusivism." This says that people may be able to respond to Christ even though they don't realize it's Christ. This could be people have haven't heard of Christ or who for one reason or another heard of him in a way that they couldn't believe, even though they're the kind of person who could respond to him. However the assumption is that there are still some people who will end up in hell.
So are there alternatives to hell? Yes, but they aren't normally considered orthodox. The major alternatives are
* conditional immortality or annihilationism. This assumes that those without faith won't be resurrected or that after judgement they will be destroyed. Some people see signs of this in Jesus' teaching.
* universalism. The usual Christian form assumes that God will reconcile everyone to himself. 1 Cor 3:10 can be understood this way, though the usual understanding is that it applies only to Christians. Some people see signs of universalism in Paul's writing. If 1 Cor 3:10 is understood as universalist, it suggests an interesting alternative. Suppose that everything not built on Christ is destroyed. For people who have gone badly enough astray, this could leave them with little beyond what they were like as an infant.
I should note that CF prohibits discussion of any alternative to hell in any forum restricted to Christians. These alternatives are a major topic of discussion in the Unorthodox Theology forum. Parenting is not the place for theological arguments. That's why I'm giving you a summary of the alternatives but not arguing for any one of them. One thing I am willing to say is that some form of judgement seems essential, as I noted in the first paragraph. And I am confident that when we finally see God face to face, we will find that what he is doing is both just and merciful.
If you want to avoid taking a position, you could say:
* The Bible, and Jesus' own teachings, are clear that we are accountable to God, and we will appear before him. If Christ is our savior, Christ will represent us. But even with that, 1 Cor 3:10 suggests that any part of our lives not built on Christ may be lost.
* This is a good thing. We want good to win in the end. That means that God must reject and defeat evil. Do you really want him to allow evil people into heaven without dealing with their evil?
* Christians differ on exactly what form God's judgement will take for those who don't accept Christ. The fiery pit is certainly a symbol, but it's not a symbol for anything you want to happen to yourself.
* I am convinced that when we finally understand what God is doing, we will see that it is both just and merciful.