Honestly, as an atheist, one of the biggest "fears" about death that I have is that I know I won't get to know how it all works out. Not just what eventually happens with my friends and family, but what eventually happens with humankind. I would love to know the state of the human race in the year 3000, but I never will. It's like reading a really complex, interesting novel, and knowing that it remains unfinished, and there's nothing to be done about it.