evolution of Satan's role in Christian theology, tracing his transformation from a minor figure in the Hebrew Bible to a major cosmic adversary. It highlights how Satan's character, identity, and functions have been continuously reinterpreted, influenced by both internal theological needs, such as explaining the origin of evil, and external cultural currents. The document details how the New Testament solidified his image as God's enemy, while Church Fathers established his backstory as a fallen angel. It also examines the diverse interpretations of Satan across different Christian traditions, from the literal belief in Evangelicalism to symbolic understandings in Liberal theology, ultimately emphasizing his consistent role as tempter, deceiver, and accuser, whose defeat is central to Christ's work.