Angels have long fascinated people. Stories, legends, and myths concerning angels abound, often even within Christianity, but everything we know with certainty about angels is found in the Bible. Angelology is the study of what the Scriptures reveal about angels, and there is much. A subcategory of the doctrine of angels is that of demons, or fallen angels, including Satan himself. In recent times the Spiritual Warfare Movement has perpetuated many fanciful and imaginary ideas about demons that are largely based on experience, not the Word of God. These errant teachings are identified and challenged by Scripture and the biblical teaching on demons provided.