40 Biblical Prayers To Cast Out Demons. What are Demons? Demons are the fallen angels that fell with the devil from heaven when the devil was sent away from heaven into the earth. NOTE: Kindly Read My Dream Interpretation Book And Other Inspiring Books… Demons are the unseen agents of the devil used against the Christians to attack them, and derail them from the fulfilment of destiny. Demons are the spiritual enemy the devil is always engaging upon the lives