think about this -maybe a rock is self aware. We can't prove it isn't, maybe the mechanism by which it works is so incredibly simple -or complicated that we can't see it. Maybe it takes 440000000 years for a rock to think one thought. We won't ever know. But does it concern us -no, life has too many real problems for us to be thinking whether rocks are alive. Unless we were to say that if we didn't worship this rock and give it all our money, we wouldn't have a good 'afterlife'. Likewise, the existance of an afterlife is just as unprovable as the living rock.