I get most of my theology from C.S Lewis and G.K. Chesterton, so admittedly, that's pretty limited. (It could be worse, though - I could base everything I believe on Creflo Dollar. (= )
In Lewis'
The Great Divorce, he imagines a group of souls who take a holiday to heaven from hell, a seemingly limitless gray town filled with insubstantial houses and shops. The book begins with a queue in the gray town with people lined up for the bus (including the speaker, who seems to be Lewis himself), and the rest of the book is concerned with what happens to several of these ghosts.
About half-way through, the narrator comes across what looks like the Scottish writer George MacDonald (whose
Phantastes had influenced Lewis a great deal). MacDonald becomes the narrator's guide through the rest of the book.
Here's a quote:
(Unnamed Narrator): 'But what of the poor Ghosts who never get into the omnibus at all?'
(George MacDonald): 'Everyone who wishes it does. Never fear. There are only two kinds of people in the end: those who say to God, "Thy will be done," and those to whom God says, in the end, "Thy will be done." All that are in Hell, choose it. Without that self-choice there could be no Hell. No soul that seriously and constantly desires joy will ever miss it. Those who seek find. To those who knock it is opened.'
And further in:
(Narrator): 'In your own books, Sir,' said I, 'you were a Universalist. You talked as if all men would be saved. And St. Paul, too.'
(MacDonald): 'Ye can know nothing of the end of all things, or nothing expressible in those terms. It may be, as the Lord said to the Lady Julian, that all will be well, and all will be well, and all manner of things will be well. But it's ill talking of such questions.'
MacDonald goes on to explain his comment in terms of Time and Freedom, explaining what he means by his statement (but it's about a page and a half, so if you're interested, you can check it out).
Many Christians probably won't accept
The Great Divorce as being anything like reality after death, but the thing is, none of us really know what happens after we die. We might all just rot in the grave, and that's the end of us. And Lewis wasn't intending his book to be anything like what heaven would actually be like, just one idea. Still, it's a good book to read, if only to present one plausible idea about what life after death (if there is such a thing) would look like.
Sartre wrote, "L'enfer, c'est les autres," something like "Hell is other people." To this, Lewis adds the other view - "l'enfer, c'est nous-meme" - Hell is Ourselves.