It is a commonly held Christian belief that the state of the world today, complete with pain, suffering, and sin, is a result of man's disobedience towards God, and not resultant from a faulty design. This is, in fact, one of the primary arguments against the Problem of Evil put forward by preeminent Christian apologists like William Lane Craig. Genesis 1:31 explains that God viewed His creation as "very good." It can only be assumed that an all-powerful, all-knowing being would hold high standards for Himself, to the extent that His creation would need to be perfect in order for Him to be proud enough to exclaim that it is "very good." After all, anything short of perfection for a perfect being is, well, a bit lazy.
But, how good was God's creation? Clearly, to a reasonable person, a bit short of perfection. The very fact that the world could be made imperfect by the actions of man demonstrates that it was not in fact perfect, and thus short of God's full potential. A world that cannot be sullied is demonstrably closer to perfection than a world that can be made imperfect. God, being omnipotent, could easily create a world that is incapable of being sullied, even while preserving free will. Therefore, if, for the sake of argument, we assume the theistic position to be true, God could be deemed to be at fault and ought to take the blame for at least most of the evils in this world.