According to scientific materialism, we human beings are just chemical machines (“throwaway survival machines,” to quote the arch-materialist Richard Dawkins) whose only purpose is to survive and reproduce, so that our genes can continue. Otherwise there isn’t really much of consequence in our lives. We may attempt to create other kinds of meaning – for example, by following a religion, trying to become rich or famous, or trying to make the world a better place – but all we’re really doing is following our genetic and neurological programming. Even our consciousness – the feeling of having experience inside our own heads – may not really exist, or is just a kind of shadow of our brain activity. 

However, I take the rather unfashionable view that there is meaning to life. I don’t think we are just ghost-like entities living inside our machine-like bodies with an indifferent machine-like world out there, in cold separation on the other side of our heads. That human life is just a meaningless space between birth and death, for us to spend trying to enjoy ourselves and forgetting the futility of everything. I think that human life and the world mean much more than that. (I’m not religious either. I consider myself an atheist.)