1. What is he/ it?
2. Why doesn't God simply destroy Satan or is he not all powerful
3. Do Christians really believe in a being called Satan, or just in the possibility that some people are capable of doing bad things?
4. Where does Satan exist, it can't be in heaven, it can't be in Hell so where is it?
1. Some say a Cherubim, but I think think the better translation is that he was beside the Cherubim. The closest angelic word would be a Seraphim. He is the "snake" in Genesis, but the word snake here has a triplicate meaning of Diviner (you shall not die), Serpent, and shining one. So don't think of it as a snake, it isn't actually a snake in Gilgamesh either, the word translates there as earthlion, which refers to the "dragonlion" adversarial motif of Mesopotamia. A latter example would be the Mushussu.
2. He will. However God must act according to his nature. When we say He is omni, it means he is Omni within his nature and what is logically possible. He can't say "I will not do X" and then do X. So satan is in this position of authority, we see that in Matthew 4:9. satan isn't offering Jesus the physical rule of an empire. he is offering Jesus the spiritual ownership of them. Jesus refuses the offer. Then, when he is being tried by the Sanhedren before his crucifixion, He references Himself to Daniel 7:9.
I saw in the night visions,
and behold, with the clouds of heaven
there came one like a son of man,
and he came to the Ancient of Days
and was presented before him.
14 And to him was given dominion
and glory and a kingdom,
He defeated satan through his work, and He is reclaiming the nations from satan as we speak but it will not be finished until the end. In Luke 10, when He sends out the 72, that is a specific number relating to the table of nations. It is an invasion force to the nations, and it is during that chapter that Jesus says satan fell from heaven. That was the day that he declared war. He is not doing this in a physical way, but removing the spiritual authority of satan over the nations. We can actually go and look at the testimonies against the Christians of that time, and what they report is that the gods stopped working because of the Christians, they even began to report that they died, like pan for example.
3. There are a few Christians who believe that only God exists and so they naturalize all miracles and beings in the Bible as if they were a disease. They remove satan as well. That is a tragedy of faith.
4. In Job he is described as walking to and fro upon the earth, however at that time he was not bound to the earth.
satan means adversary, however he gets the proper name satan from Revelation 12:9. He is not the only adversary because he does not rule the nations alone, there are others like him which we learn about in Psalm 82, but he is chief among them.
