Of course no one can give scientific evidence for what is in the mind of man, however, there are strong indications that my statement is correct. For example Darwin himself was against helping the sick and lame. We also know quite well of the deeds and behavior of such atheists like Clinton, Hitler, Stalin, Pol Pot, Mao, Idi Amin and numerous others. However that atheism is clearly an excuse for breaking the very moral code of the Ten Commandments and those of common morals is quite clear. People who believe in the divine creation of life are much less likely to consider life valueless. People who believe that life came from God are much less likely to kill humans as if they were vermin than those who do not so believe.
Oc course this doesn't prove god but only that a belief in a god (whether he exists or not) can restrain people from killing each other.
Tell it to the ghetto jews, the witches, the Knights' Templer, the Spanish victims of the Inquisition, the Gnostics, or the European Anabaptists. (ooops, there aren't any, thanks to Papal Genocide). On the available statistical evidence, there is no good reason to expect the genocide rate to be any lower, per capita, under the Church than it was in the Nation-State.
I could say the same thing about religion. Religion may not match socialism in numbers, but then socialism IS a religion -- an in "the God That Failed".
Religion is a way of looking at the world rather than a particular set of beliefs. The central defining characteristic of religion is that truth comes from authority (witness) rather than observation of worldly things. One does not need to be a Christian, or even believe in God to be religious. It is a matter of temperament.
I suspect the Bible would support me in saying that believers can be sinners and that Samaritans can be good. There is no correlation between faith in authority and personal goodness.