Atheists are not homogeneous group as atheism, is merely the absence of belief in gods, rather than any unifying belief, system, or traits. Personally, I don't see much need for atheists to help people as a unified force of atheists, other than to simply make it clear that the resistance to theistic absurdity is slowly, but steadily growing in this new century of a more globally-linked human consciousness. As for atheists themselves, just like theists ought to, they can help people by striving to be the most constructively progressive, morally decent, and deliberately intelligent form of humanity that they can muster in order to perpetuate better then the plate of crap we were handed.
I don't know about you, but I help people help themselves toward better every day. I do that not specifically as an atheist, but as a human being. I'm not saint and I don't do half of the ''good'' kinds of things people might think a good person should do to help others, but I do what helps people help themselves and help others in turn. That works for me because it does not send the wrong message, teach the wrong lessons, or irresponsibly cause subsequent unnecessary problems that need solving.
I don't know about you, but I help people help themselves toward better every day. I do that not specifically as an atheist, but as a human being. I'm not saint and I don't do half of the ''good'' kinds of things people might think a good person should do to help others, but I do what helps people help themselves and help others in turn. That works for me because it does not send the wrong message, teach the wrong lessons, or irresponsibly cause subsequent unnecessary problems that need solving.