Donkey
" I would stop being an atheist if God were to show himself. "
How do you picture God showing himself ? Would it take a huge being on a cloud that descends down upon the entire earth, everyone quaking in their boots? What if an average looking man did some miracles? What if the oceans parted? What would it take?
I don't know of anything that would make me not believe in God anymore. I think the only other alternative would be to accept that we will grow old and die. Nothing after that. I choose to believe that in there is an afterlife, and that it could be so much better than this one.
Interesting post BTW