How did ancient semites deal with demon possession? Once a person came under the influence of demons, generally an exorcism was the only remedy. Here are some strategies sorcerer-priests used to banish evil spirits including magical preparations using various objects, incantations, and various magical rituals.
By studying the historical Christian origins, you can see how different theologians interpreted the Bible as they did, how their opponents countered, and ultimately, who won.
The Testament of Job, written sometime between 100 BC-100 AD, shows how Satan’s role and character evolved from a servant of God to the spirit of idolatry and vengeance.