1 and 2. Who created sin? Where did it come from? For this we turn to God's explanation. In Ezekiel 28 we have the whole history of sin. There Satan is described under the symbol of the king of Tyre ez2811ff. Note verse 15:

    We first meet Satan speaking through a snake in the Garden of Eden (Gen. 3). Before that he had been the closest to God in heaven. When he rebelled, God cast him and the angels who took his side out of heaven (Rev. 12). That's how he came to earth. Also see Isaiah 14 is14.
   God could have destroyed Satan in an instant, but someone could ask if God did the right thing. Maybe Satan was right. They would obey because of fear, not love. That would not be happiness and closeness to God. I believe that, when it is clear to everyone in the universe, then God will destroy sin and sinners. This includes Satan himself as you see in the text quoted. Some people believe that people burn eternally, but the Bible doesn't teach this. See my website on Rev. 20:9, 10. re2009f.

   Sin has no logical explanation. If there had been a need or reason for it, God would be wrong to punish sinners. Because we are children of Adam and Eve we are pulled toward sin to please appetite or pride or some other selfish desire. How is this?
   In the garden (Gen. 3, above) Adam and Eve were told not to eat from the tree of the knowledge of good and evil. God didn't want them to experience evil but if He had not given them a choice, we could say that He forced them to follow His way. So Satan was given permission to tempt them.
   Satan, through the serpent, planted doubt in Eve's mind. He told her that God just wanted to keep her from being like a god -- that she would not be punished for disobedience. Adam knew eating the fruit was wrong. He just didn't trust God to provide a replacement for Eve so he ate, too. What they had done was to trust Satan instead of God. Satan claims that this world is his (Matt. 4:8, 9) mt0408f. That includes you and me. The easy and natural way for us is evil. To be redeemed, we must choose to follow Christ. Then he gives us some of the divine nature. Read 2 Peter 1:1-4 2pe0101.

   Yes, we have already shown this. Be sure to read the early chapters of Genesis carefully, especially chapter 3. Notice God's words to the serpent (snake) v.15. He spoke to Satan as if he were the snake. That is how he approached Eve. The prophecy was that, although the snake would bite the woman, she (through the righteous people born through her) would crush his head. The "seed" or descendant that would gain the victory for her is Christ who refused to fall where Adam and Eve did. He was faithful to death on the cross. Because of His victory, He can give us victory if we follow.
   Understanding the curse in 3:15 helps us know that it was Satan who spoke through the snake.

   We have already answered most of this. The entry of sin is also shown in chapter 2 beginning with verse 4. verse 5 begins with "Before." Then are described results of sin. Rain first came at the time of the flood. Man had to work in the field as part of the curse in 3:17-20. Creation of Adam was before that time of the entry of sin. You can study the text.
   Sin was in the serpent. We could say we go to find it, but basically, it is our choice. God wants happiness for us. Jesus died for all sinners. It is up to us to accept His way of happiness and, in His strength, remain faithful 1jo0109.

----------------
   May God bless your study and your ministry for His glory,

Ted Wade