The question of why evil exists is not a theological question, for it assumes that it is possible to go behind the existence forced upon us as sinners. If we could answer it then we would not be sinners. We could make something else responsible...The theological question does not arise about the origin of evil but about the real overcoming of evil on the Cross; it ask for the forgiveness of guilt, for the reconciliation of the fallen world 
Dietrich Bonhoeffer, Creation and Fall Temptation: Two Biblical Studies
christianity, creation, temptation