Second, if you disbelieve in the reality of good and evil spirit agents, you fundamentally change the narrative of Scripture. The motif of spiritual warfare is a through-line of both the Old and New Testaments (NT). And in the NT, the meaning of what Jesus was doing in his life, ministry, death and resurrection is fundamentally tied up with the belief in spiritual warfare. Take away Satan, and you take away one of the most fundamental reasons Jesus came to earth!