Nothingless void is as believable as afterlife. From scientific point of view neither make sense, it’s like we’re giving ourseleves some metaphysical distinctiveness from the rest of universe but are merely physical bodies inside of it according to our scientific knowledge. And according to that we precisely know what’s after death: we rot in grave, and that’s it. But that answer is not satisfying for us, because what we call our consciousness will stop existing at some point, and we try to find logical state of us, when there is no longer us. I don’t really think it’s possible to describe how’s that like at all.