As far as I'm concerned, it's not "how can you prove there's no afterlife?" it's "what is your reason for believing there is?" I understand people want hope and faith that life isn't it, but just because you want it to be true doesn't mean you can go around telling everybody that it is definitely true.
first of all, i never tell anyone its true, this is a debate and i'm merely expressing my opinion, the same as you.
i'm not religious, i havent been to mass in years and i never pray or anything, i even dislike the pope. and dont ask me what i think of the bible.
my belief is that this cannot be the high point of the evolution of our consciousness (i hope i said that right). i believe there is more to it than occupying this body. i believe while our bodies may not evolve, that our consciousness can.