Being raised in the Catholic faith, I was led to believe that if one dies with a mortal sin on one's soul, one goes straight to Hell. Because we are inherently flawed humans and engage in sinning on a regular basis, the only way to avoid a trip to Hell is to cleanse your soul by going to Confession. Unfortunately, my last confession was nineteen years ago.
So, what would Hell be like? I tend to think that it is different for everyone. Individualized. My personal Hell would be a small room, roughly the size of, say, a powder room. And in that small room I would be trapped with two small girls. The bigger girl would have a wicked case of encopresis and a dreadful fear of having a bowel movement in the toilet. The smaller girl would sit on the toilet only to get right off and urinate in a big puddle all over the floor. Add to this lovely scene that I would be required to read Once Upon a Potty eighty million times.
This is what it would be like for me, if you believe in this sort of thing, of course.