Demons are spirit beings who do not have a body of flesh and blood. Since demons are fallen angels, like angels they are immaterial and not usually subject to human visibility or our other senses. They are dwellers in an unseen world. To manifest themselves among men, they must possess or control a physical body of a person or an animal. As they possessed people, their influence had its effect in several different areas.

In the Dark Ages and Middle Ages, demons were thought able to travel on the earth invisibly, but to assume physical bodies at will. The same was understood concerning angels. This has a certain logic. In order to tempt human beings, demons need to remain invisible while they whisper seductive words or cause opportunities to commit sin to fall across the paths of their intended victims. But in order to murder their victims once their temptations succeed, demons need to have teeth and talons capable of ripping flesh.

The modern view of demons, among those who believe demons in the Christian sense to exist, is that demons are usually invisible but are capable of revealing their forms at their pleasure. It is not so widely accepted that demons can make their forms material. The modern demon is thought to punish those who give in to its temptations by possessing the victim's body and using it against the victim and the loved ones of the victim. Frequently the possessing demon causes the victim to commit a horrible crime, such as the mass murder of elementary school children, before committing suicide.

- Intellect (Mark 5:7),

- Knowledge (Acts 19:15),

- Emotion (Matthew 9:31; Mark 5:7; James 2:19),

- Self-awareness (Mark 5:9),

- Will (Matthew 8:31)

- Ability to speak (Mark 1:24; 5:7-12; Acts 19:15).

- The modern concept of demons owes many of its key features to the influence of Christian folklore and theological doctrine, which were heavily influenced by Jewish beliefs through the Old Testament. In Christianity, a demon is not just a malicious spirit, but a spirit of hell sent to Earth by the Devil to enforce his authority or to carry out his purposes.

“The other shape If shape it might be call'd, that shape had none,
Distinguishable in member, joint, or limb;
Or substance might be call'd that shadow seem'd;
For each seem'd either; black it stood as night,
Fierce as ten furies, terrible as Hell,
And shook a dreadful dart; what seem'd his head
The likeness of a kingly crown had on.
Satan was now at hand; and from his seat
the monster, moving onward, came as fast
with horrid strides; Hell trembled as he strode."
John Milton’s Paradise

- The truth is that demons are more likely to appear in attractive. They love to masquerade so even Christians are fooled by them. Paul warned them that even "Satan himself masquerades as an angel of light. It is not surprising, then, if his servants masquerade as servants of righteousness" (2 Corinthians 11:14-15).

"they sacrifice to demons, and not to God; and I do not want you to become sharers in demons. You cannot drink the cup of the Lord, and the cup of the demons; you cannot partake of the table of the Lord, and the table of demons" (1 Cor. 10:10-21 ).