Are Demons Real does evil exist? The answer is YES! (a few scriptures)
Mark 5:9 And He asked him, What is your name? He replied, My name is Legion, for we are many.
Mark 5:15 And they came to Jesus and looked intently and searchingly at the man who had been a demoniac, sitting there, clothed and in his right mind, [the same man] who had had the legion [of demons]; and they were seized with alarm and struck with fear.
Luke 8:30 Jesus then asked him, What is your name? And he answered, Legion; for many demons had entered him.
In Matthew, and other verses, it talks about Jesus setting people free from Demons. It also talks about the demons being afraid of Jesus and they know who He is but they do not know you! So the only one who can set you free from evil (demons) is Jesus the Christ!
Matthew 4:24 So the report of Him spread throughout all Syria, and they brought Him all who were sick, those afflicted with various diseases and torments, those under the power of demons, and epileptics, and paralyzed people, and He healed them.
Matthew 8:16 When evening came, they brought to Him many who were under the power of demons, and He drove out the spirits with a word and restored to health all who were sick.
Matthew 8:28 And when He arrived at the other side in the country of the Gadarenes, two men under the control of demons went to meet Him, coming out of the tombs, so fierce and savage that no one was able to pass that way.
Matthew 8:31 And the demons begged Him, If You drive us out, send us into the drove of hogs.
Matthew 8:33 The herdsmen fled and went into the town and reported everything, including what had happened to the men under the power of demons.
Matthew 10:8 Cure the sick, raise the dead, cleanse the lepers, drive out demons. Freely (without pay) you have received, freely (without charge) give.
James 2:19 You believe that God is one; you do well. So do the demons believe and shudder [in terror and horror such as make a man’s hair stand on end and contract the surface of his skin]!