God did not create an imperfect world. He created a good world. In Genesis one, God says that things are good seven times.
- Light, Genesis 1:4, "God saw that the light was good; and God separated the light from the darkness."
- Earth and Waters, Genesis 1:10, "God called the dry land earth, and the gathering of the waters He called seas; and God saw that it was good."
- Vegetation, Genesis 1:12, "The earth brought forth vegetation, plants yielding seed after their kind, and trees bearing fruit with seed in them, after their kind; and God saw that it was good."
- Separate light and darkness, Genesis 1:18, "and to govern the day and the night, and to separate the light from the darkness; and God saw that it was good."
- Sealife and birds, Genesis 1:21, "God created the great sea monsters and every living creature that moves, with which the waters swarmed after their kind, and every winged bird after its kind; and God saw that it was good."
- Animals and creeping things, Genesis 1:25, "God made the beasts of the earth after their kind, and the cattle after their kind, and everything that creeps on the ground after its kind; and God saw that it was good."
- All he made, Genesis 1:31, "God saw all that He had made, and behold, it was very good. And there was evening and there was morning, the sixth day."
So, what God created was good, and he also made Adam and Eve as free creatures who were able to rebel against God. Because Adam represented mankind (1 Corinthians 15:22; Romans 5:18; Romans 5:12) when he fell, sin entered into the world and the world was no longer "good." It was affected by the sin that entered through him, and the world became "imperfect." That is why we have plagues, earthquakes, sicknesses, theft, murders, lying, adultery, etc. The effect of sin in the world makes it "imperfect"--not God. He made it good, and it was ruined when Adam sinned (Romans 5:12).