Pain, pleasure, cognition... they are all biological factors. Why would I feel pain in a hell, when it is purely positive feedback from your vessel suggesting something needs to be done to stop whatever is hurting? Pain is not bad. It's like an alarm clock. Sight, is biological, so we can assess and survive our environment better than someone without eyes.
All conceptions of an afterlife assume these factors.
When we die, we know that our body decomposes and our energy is either recycled by bacteria chemically or an addition to entropy.
No physical law or biological trait suggests that an afterlife exists. Surely a rough percentage could be calculated but I'll leave that to you.