There should be enough to keep you busy in life without having to worry about death. Personally I don't care about my death. I'll be dead, so I don't suppose I'll be around to worry after the fact either.

There's no reason to believe there's any life after life. Given that we know that a person's body disintegrates after death, and that a person's body has at least something to do with mental functions, there's good reason to believe that there are no mental functions after you die.

Why would you associate a dying person's memory of a white light with death or an afterlife, let alone with any god? I imagine when my brain starts to shut down I'll experience all sorts of things. Or I'll imagine I did, when you jump-start my brain afterwards. If you cough in the dark, you'll see a bright flash of light sometimes. Is that God too?