That's just it, we can define the words any way we want to come up w/ any afterlife of our chosing, but none of that will do anything to whatever afterlife there is. My problem is that there's a lot of good evidence that there's nothing after we die, and there's other just as good evidence that it's really neat, and my conclusion is there's simply no way to nail it down here and now. Meanwhile I got a great life to live so that's what I'll keep busy with.
There's no reason to blame the loss of the human race on something bad. Everything in this universe has limits (except reality maybe). My guess is that we'll be replaced by our mutated kids who will most probably be far more powerful and capable than us. Homo sapiens have only been around what, 100k years? The previous humans (before the Neanderthals) was homo habilis and they hung around a million years. The future's really hard to predict.