I think that, wrong or not, looking forward to an afterlife is far better than looking forward to nothing after death.
One of the great sweetness es in life is looking forward to something, if you have nothing to look forward to your life is dull and purposeless. Once you die, it will not matter if you were wrong about an afterlife, but it did make your life that much sweeter. You lived to do your best to prepare for another life, you lived looking forward to something, and you lived with comfort and assurance. This is what I see in my family.
Living not knowing if there is something after death or even thinking there is nothing is a life of fear, a life with nothing after, a seemingly pointless blip of an existence that will, except in a very very few cases, be forgotten completely. You live a short life, then you have nothing. Even your pathetic existence, while it lasts, is full of the fear that it could end any time. Nor is it very important, there are billions of others like you, or more important than you. Your existence is temporary, it will inevitably end, and it isn't even very important.
I am also interested in hearing people's thoughts on these: how valuable is a human life? How important is it? And why?
What is the point of life? Why do you bother living?
Everyone needs to be able to answer these questions and I will ask a few more if people do.
Essentially, debating to try and prove each other wrong is pointless, and not just pointless, but almost stupid. I doubt anyone is going to change their views. It is much more important to try and think deeper and evaluate yourself and your world, a discussion of beliefs (expanding from religion because atheists say they aren't religious but I think their thoughts to be included).
Views can change, I myself was a strong catholic turned athiest/agnostic, but I suppose the chance of your views changing because of a game forum is minimal. I do think it is important to evaluate yourself and the world but you must do so objectively and with thought to a greater picture for society rather than simply your own fate, and eventual death, all the time.
In my opinion, the purpose of life and continued existence is the advancement of humanity. Our society as a whole can almost be considered one entity that grows, learns, becomes sick, gets healed, etc. Although our individual lives are relatively short, we each contribute to humanity for better or for worse. Through reproduction, passing along knowledge, and collectively gaining wisdom, we immortalise humanity. Our greatest hope should be to live everyday to the fullest and when approaching death, be content in knowing that humanity will go on and hopefully benefit from your life.