Sidster bro,
in this thread i am speaking for religion in general. Other than that, i know rest of the other religions can adapt and improve and make society a better place.
After all, what is the contribution of Atheism to the world?. Can you list any positive contributions that improved society?.
At least religious doctrines teach us to be good human beings. And the other thing is that just because someone says that he is a hindu or christian doesnt make him one. Because religion has a doctrine to be followed which encourages good behaviour. Someone who deviates from that good path automatically loses his right to that religion. So in order to prove that a crime was done by a religion, you have to prove that the person doing that crime was a devout believer and was doing as per the teachings of his faith. For example, the war in the middle east was for economic reasons, superficially it looks like chrsitians vs muslims. You also have to prove that those so called religious wars would NOT have happened if there was no religion component to it. 
I am not saying the Sudan war did not have a religious component to it. But if you read it as our friend has kindly put the link above, and do more research on it, you will realise there were other factors as well. So do you mean that had there been no religion, those wars would not have happened?. 
Yes Pol Pot and Stalin need some accountability. As they both were Atheists, then fellow Atheists should reflect.