Much depends on you interpret the Bible. Notice, for example, Satan in the Hebrew Bible (aka the Old Testament) has an article before the name. So the proper title is "the Satan" which translates as "the accuser". Notice also, in the Hebrew Bible, the Satan is depicted as being a part of God's heavenly court (see Job, chapter 1). The Satan's job in the Hebrew Bible seemed to be similar to a prosecuting attorney by keeping track of people and their actions then presenting information to God.
The evil, conspiring, titanic battle between God and Satan we have come to know appears in the New Testament. It is my understanding there is approximately a 300 year gap between the last writing of the Hebrew Bible and the time of the New Testament writings.
There is a theory that this change in perception of the Satan can be traced back to the Persians. When the Persians conquered the Babylonians, the Persians released the Jewish leaders of the Southern Kingdom who had been captive in Babylon. Prior to their release, the Jewish leaders were exposed to the Persian belief that the world is divided in two spiritual camps. A camp of good and a camp of evil. Both camps are fighting for control of the earth and it's people.
The view worked out well for the Jewish leaders who were trying to understand how they as the chosen people were conquered by the Babylonians. The idea that at least some if not all the blame for being conquered by the Babylonians could be applied to the Satan was very appealing. Thus, by the time of the New Testament writings, the Satan was protrayed as an evil force trying to conquer the world.
On the other hand, there is the passage from Isaiah 45:7 which reads in the King James version:
I form the light, and create darkness: I make peace, and create evil: I the LORD do all these things.
This creating evil would seem to imply creating the Satan so, since God created it, God is responsible for evil, and God can do whatever God wants to do with evil including binding or unbinding.
There are probably many other views and understandings. May your quest for understanding yield much fruit.
As always,
OldChurchGuy
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