I was taught that evil came after GOd created man and God favored man over the angels which was when LUCIFER got jealous and declares the HE was equal to GOD and then ebsued a battle between the angels who were good and those who followed LUCIFER. St. Micheall the Archangel defeated him and caste him and his legions out of heaven.thus the dicotomy of good and evil was formed... later after Lucifer tempts the woman to eat of the tree of knowledge and they learn by eating of the tree that there is evil as well as good in the world until then they did not and this is evidenced by then coverign them selve in GOds presence when before they walk with him in the garden and were not ashamed of their nakedness. Upon obtaining the knowledge of good and evil man had a choice and the free will to choose GOOD or EVIL.