I don't think that we just cease to exist as soon as we die. And I don't really believe in God or any particular religion's afterlife. But let me throw something at you that always makes me feel better: we are made of stardust. When stars exploded to form the earth, and the earth formed us--if you don't believe in the Big Bang or evolution, that's cool--we were made from the same materials...stardust. I just find that fascinating. Like, you look up into the night sky and say, 'hey, you might be my Uncle'. Just kidding, but it makes us seem a lot less...insignificant. Also with your biomass idea...when we die, our matter is given back to the earth. There is always the same amount of matter in the earth. So eventually, you'll become a flower, or a long-lasting ROCK, or maybe even a 'brand-new' little human. Because we're all recycled. How very efficient!! So just because you die does not mean you do not move on. You do, in other forms! I hope this helps you!