Many modern scientists think humans are just "biological machines". If we are just machines then we should not be able to conceptualize us as being anything else than machines, we would have never thought of things like soul or free will. Also, I don't think we could understand anything. A computer can be programmed to act as though it understands patterns and trends, but it can never get that feeling of understanding. I'm not sure if all this is true, its just some arguments against Nihilism. I'm not arguing for an religion (I like Buddhism, its thats a very personal relgion), I just want people to see that there's other beliefs than the sheer Nihilism that too many people are starting to accept.