The Reality Of Demons by John Hagee

Then was brought unto him one possessed with a devil, blind, and dumb:  and he healed him, insomuch that the blind and dumb both spake and saw.

Jesus Acknowledged The Reality Of Demons
Twenty five percent of Jesus’ ministry was dedicated to casting our demon spirits from those to whom He ministered Matthew 15:28; Mark 5:1-16.

Jesus never sent anyone out to preach without giving them power over demon spirits Mathew 10:1.  Jesus cast out demon spirits in public and commanded the church as a natural order of worship to cast out demons Mark 16:17.

Fallen Angels are not demons

There is a distinct difference between fallen angels and demon spirits in the Scripture.  The differences are as follows:

1. Angels have wings Daniel 9:21 and demons do not have wings Matthew 12:43.  Therefore, they cannot be one and the same.
2. Angels normally inhabit “the heavenlies” Ephesians 6:12, Jude 6; Revelation 12:7-8 while demons are earth bound.
3. Angels have bodies of their own and do not desire to occupy another body, while demons have an intense craving to inhabit a body.  That body can be the body of a man Matthew 12:43-45, Mark 5:11-13 or the body or an animal Luke 8:32.  Form scriptural evidence, demons prefer the body of a man so they may gratify their evil desires and perversions.

Source:  Facts About Satanism in America