What is the meaning or purpose of life? I do not know, but I know that an atheist who commits his or her life to helping others is behaving far less selfishly than a theist who commits his or her life to getting into heaven.
True enough, at least on the face of it. It's always possible the atheist is only doing it to impress the uber-hot Christian chick he's trying to bang. Or something.
Apart from giving me an excuse to post 'uber-hot Christian chick he's trying to bang' in a thread, somewhat in context, I guess my point here is that things are really pretty simple.
People who are helping others without expectation of reward (whether that be from God, or some other source) are behaving less selfishly than those who who do so for reward.
The tricky part is working out who...if anyone...is completely altruistic. I kinda lean to the view that no-one is. But...like everything else I suspect...it's not a binary position. A person is not simply 'altruistic' or 'not-altruistic' but instead moves about on a continuum on a situational basis.
Note: I am not saying all theists selfishly commit their lives to getting into heaven, nor am I saying all atheists selflessly commit their lives to serving others. D'uh.
Whilst sad that you felt the need to add that, I COMPLETELY understand why you felt the need to add that.