I think the golden rule is a good place to start for a definition of good.
(and not the one that says he who has the gold makes the rules)
I agree that religion should not be forced on children, but that is a tough nut to crack as far as enforcement.
Which brings us back to why we dislike religion: the religious cant help but to try and force their beliefs on others.
as for exploitation, well what you described is a perfect example of exploitation.
Traditionally, the Golden Rule is to treat others as you would wish to be treated.
I think this quote sums it up:
"With or without religion, you would have good people doing good things and evil people doing evil things. But for good people to do evil things, that takes religion." - Steve Weinberg
Religion (a complete system of ideologies) can persuade people to blow themselves up in order to kill others. Atheism simply, by definition, CAN'T. political movements can, Atheist individuals can, Atheism as a belief system (a non-belief system technically) CAN'T.
The main difference between politics and religion in this specific case is a deity that justifies its actions. The pope can condemn Christians in Africa to die of aids (by insisting they don't use condoms) and thats fine because he is backed by God, Whereas Stalin's actions are not.
Basically the pope (and other religion endorsed leaders throughout history - Saudi Arabia for a start if we are talking Moslem, the woman who got raped and then was stoned to death for sex out of wedlock... is that justice??) defers responsibility of his actions to a higher power. The fact that so much of Humanity is fine with this concept makes me physically sick.
Stalin studied for the priesthood, and it was in the seminary that he became an atheist. He was also a published poet and an accomplished bank robber who provided the Party with a lot of stolen money over the years. At first he supported the Revolution and the Party, but then worked only to amass and consolidate his own power. Pol Pot's ideology was the restoration of a Cambodian golden age, with what he understood as traditional, RURAL Cambodian values. Mao was an atheist, yes, but in a sense his god was the revolution. Hitler, as everyone should know by now, was a Catholic, and most of his cadre were followers of the state church in Germany, Lutheranism. All of these mass murderers were devoted to anti-humanist ideologies as powerful as religions.
Theists often say that without fear of divine punishment, humans are free to commit atrocities, but the flip side is that with the belief that they are doing God's will comes the same sort of license.
I don’t think any atheist would commit a crime for the sake of atheism. That goes well with religion when it comes to dominance of the turf. Atheists don’t have to win lands or minds in the name of god or something else. As far as Stalin or other despots are concerned it was politics of power that made monsters of them, not atheism.
I'm currently under the impression that no wars have been caused by religion or atheism. It seems that every war and atrocity always starts with politics and resources, then leaders use whatever methods they have available to rally their people. Often, that means raising the flag of religion.
I like to think of religion as a motivator, in the same way that patriotism can be a motivator. You can use these motivators to get people behind a variety of causes, both good and bad, but never is the motivator the reason for the action itself.
EDIT: Also, even though this hasn't been brought up, you'll probably end up having a similar discussion about Mao one day. I don't claim to be an expert about China, but my understanding is that the millions of deaths that are often attributed to Mao were not intentional deaths. He put in place policies that lead to poor irrigation and ultimately millions starved to death.
It's easy for people to just look at the numbers and say "he was as bad as Hitler" without acknowledging that Hitler knew he was killing people while Mao wasn't intentionally starving his people (as far as I know).