Wait a minute.. None of us are the first to question "Why does evil exist?"
Job himself asks God why. Its a popular question 'If god exists? why is the world full of so much evil?" Have you tried searching through the scriptures for your answers or do you assume you'll find this wisdom on a forum? Have you read Ezekiel, the passage when God speaks with Lucifer? "You were the seal of perfection, full of wisdom and perfect in beauty. You were in Eden, the garden of God; every precious stone was your covering. You were the anointed cherub who covers; I established you; you were on the holy mountain of God. You were perfect in your ways from the day you were created, till iniquity was found in you. By the abundance of your trading you became filled with violence within and you sinned. Your heart was lifted up because of your beauty; you corrupted your wisdom for the sake of your splendor. How you are fallen from heaven, O Lucifer, son of the morning! How you are cut down to the ground, you who weakened the nations! For you have said in your heart:
I will ascend into heaven, I will exalt my throne above the stars of God; I will also sit on the mount of the congregation on the farthest sides of the north; I will ascend above the heights of the clouds, I will be like the Most High
And war broke out in heaven: Michael and his angels fought against the dragon; and the dragon and his angels fought, but they did not prevail, nor was a place found for them in heaven any longer. So the great dragon was cast out, that serpent of old, called the Devil and Satan, who deceives the whole world; he was cast to the earth, and his angels were cast out with him.
How you are fallen from heaven, O Lucifer, son of the morning! Woe to the inhabitants of the earth and the sea! For the devil has come down to you, with great wrath, because he knows that he has a short time.
Genesis 3:1-5 As soon as he reached earth, Satan undertook to deceive the human race.
Man's happiness was linked to his obedience to God.
But God did not want a forced obedience: so He allowed man the freedom to follow the way he preferred. However He gave him a serious warning about the consequences of his choice.
Alas! Satan deceived him in spite of that warning, and got him to disobey. "The god of this age", "the ruler of this world" This is how the Bible describes Satan.
Luke 4:5-7 shows Jesus and Satan agreeing that the kingdoms of this world are Satan's property.
Genesis 3:17,18 Nature was also marked by the appearance of sin. The soil no longer cooperated so easily with man. Many beasts became wild. The planet became hostile with its storms, earthquakes, and other disasters.
Do I have any pleasure at all that the wicked should die? says the Lord God, and not that he should turn from his ways and live? For I have no pleasure in the death of one who dies, says the Lord God. Therefore turn and live!
With all this out there then why didn't god destory satan in the beginning?
If God had destroyed Satan immediately, His creation would then have served Him out of fear: so God chose to allow everyone the time to measure the consequences of Satan's rebellion. Fortunately, the experiment will soon come to a conclusion.
God is love.