There are unclean spirits in our churches! How do they get there you ask? They walk right in attached to humans! Jesus had to deal with one as He began His ministry. This particular spirit tried to undermine His credibility by calling Him Jesus of Nazareth, because it was said that no good thing can come from Nazareth! Jesus would have none of that and yanked that spirit right out of that man by telling him to “Be silent and come out of him!” Jesus’s credibility was enhanced causing the people to see the power behind the scriptures. At that point word spread like wildfire throughout the region about Jesus. I believe that it is important for others to know that not every person walking in the doors of the local church is a believer, and may be sent by the enemy to cause disruption and to try and soil the reputation of the church. Hopefully they will be quickly spotted before too much damage is done.
And they were astonished at his teaching, for he taught them as one who had authority, and not as the scribes. And immediately there was in their synagogue a man with an unclean spirit. And he cried out, "What have you to do with us, Jesus of Nazareth? Have you come to destroy us? I know who you are—the Holy One of God." But Jesus rebuked him, saying, "Be silent, and come out of him!" Mark 1:22-25