Common in evangelical theology is the concept of spiritual warfare: the idea that Satan and/or other demons are ever-present entities seeking to corrupt and destroy humans—especially the faithful. To resist succumbing to these forces requires constant vigilance and protection through prayer and strict adherence to the evangelical interpretation of biblical teachings. In this worldview, demonic possession or influence mirrors the evangelical concept of ideological corruption; both presume human weakness and vulnerability to external forces that can only be resisted through complete avoidance and submission to religious authority. Just as corrupting forces can enter through seemingly innocuous sources, such as reading, music, or even yoga, dangerous ideas can infiltrate through educational, political, and cultural discourse.
Fundamentalists of any ilk, political or religious, by definition, are hostile to discourse.