Isn't that in and of itself a selfish act?
It is good
For You to act with the welfare of others in mind?
You seem to be opperating with the mindset that what goes around comes around which would then mean that you expect your unselfish act to be replicated by others benefitting you.
I don't mean to be combatative but....
Gotcha.
Also, I do have a question for you which you may deny but I have experienced it myself.
Why do atheists direct the majority of their efforts to bringing down Christianity? For example, in the artical you refered to about ethics, the author wrote several times about how things like the Ten Commandments are not needed but only mentioned things from other religions (mostly dead religions too for that matter) once or twice?
God told Christians that they would be persecuted throughout the Earth by others. I have yet to find another religion whose deity tells them that specifically as ours does. By persecuting us, are you not just proving our God and our Faith correct?