Atheists prove God is required for morality. It is possible to be evil without God and to live a slave to sin, without God. It is not possible to live a morally perfect live without God. Atheists by proving God is not necessary do it at the expense of their morality and therefore, at a cost to their humanity. Given the assumption normal persons wish to be moral it can be concluded that atheists by their modelling as to what happens when God is rejected, serve as a positive proof that God is necessary to be morally good.