Well, as a fellow devout(?) atheist, for me it's just that no matter how bad life gets me down I enjoy the little things - smell of fresh bread the company of good friends - even a good book or movie!
Life is sweeter than the alternative
plus, it sounds cheesy but you never know what tomorrow will bring
and like, Tsuji says - if nothing else you can spend your time annoying insufferably happy people!
