Epicurus: 'Is God willing but not able to prevent evil? Then he isn't omnipotent. Is God is able to prevent evil but not willing? Then he isn't omnibenevolent. If God is both able and willing, then why is there evil? If God is neither able or willing then why call him God?'
The God of classical theism (omnipotent and omnibenevolence) cannot exist if evil exists. Either Omnipotence, omnibenevolence or evil must not exist, since all three are inconsistent.
The conclusion follows from a logical analysis of the definitions of the concepts 'omnibenevolence', 'omnipotence' and 'evil', without reference to experience
Augustine & Plantinga vs the logical problem on moral responsibility
Augustine's theodicy seems logically possible that God allows evil because it is either sin (moral evil) or punishment for sin (natural evil) or the work of satanic energies (natural evil). However, it is difficult to maintain that a child deserves suffering like cancer because of original sin.
Augustine points to Psalm 25:10: 'All the paths of the Lord are mercy and truth,' and concludes: neither can his grace be unjust, nor his justice cruel
Augustine said that if you doubt original sin exists, ask yourself how you would behave if your city was involved in a catastrophic war
Would you go out on the street and try to help others, or would you hunker down with your family and try to defend what you have? This is the inclination towards self-love and away from love of your neighbor that characterizes original sin
The long habit of doing wrong which has infected us from childhood and corrupted us little by little over may years and ever after holds us in bondage and slavery to itself, so that it seems somehow to have acquired the force of nature