What this does is put "good" and "evil" either side of a scale. We define many scales as part of our experience. From "hot" to "cold", from "rich" to "poor", we measure all kinds of things on all kinds of scales. What all of them have in common is that God created them. God, in most monotheistic religions including Christianity and Islam, created heat and cold, created the "ups" and "downs" and created every little in-between bit of all those scales. Likewise, God created the scale of good and evil. God could have created a scale of "amazing goodness" through to "medium goodness" down to "amateur goodness", and therefore let all beings experience no evil or suffering. That God decided to create evil, suffering and pain and put them on the scale is an inexplicable act for a supposedly all-good god. The explanation that suffering is the absence of good is not sufficient to explain why God created suffering in the first place. Either God is evil or it does not exist.