How can you be happy knowing that nothing you do means anything at all, BTW i'm not a religious zealot, i don't go to church or anything i've stated before that Organized religion is a joke. But i do believe in God, Souls, all that stuff
edit: Good lord that quote you linked of mine sure is bleak. Now that I think about it i'm sure i would eventually pick myself up but it would be VERY hard, I am sure i would still continue living life as a good person, i live the way i do because thats who i want to be, not because God told me to.