I think there is one purpose with life, which is to reproduce. The meaning of life is slightly different however. The meaning of life is all about what you make of it. I want to be happy, do the things I like and spread the joy. I'm not at all a fan of "living like every day it's your last" though.
I absolutely believe that life is the most wonderful thing you will ever have, and you should have fun, be joyful and live the way you want to. I want that for myself, and I want to help the people close to me to achieve the same thing, by being there for them.
My personal motto is: "Nothing is so bad that it isn't good for something", which always holds true. Sometimes you just need to look a little harder.
The afterlife is another question though. I believe there is an afterlife of some kind. How it works, what happens to us? No clue. But I think it's there.
EDIT: Also, I don't believe there is some all powerful deity watching over us, and there is no heaven or hell when you die.
