When a missionary talks to you for an hour about heaven and another hour for hell, whatever he said over and above 10 minutes is his own imagination. Your idea is just as good as his. Nobody really knows, and you will not know until you get there. Then it will be too late - if you go to the wrong place. We must not become pessimistic, see.
Sin is a reality.
We have to balance out in our life our approach to eternal realities. There is heaven waiting for us - or hell. One or the other. They both exist. So that we have a motivation, which is heaven, to keep us in line.