The following is from a site on a sermon about Matthew 13:24-30;36-43.
"Lessons from the Weeds"
For our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms. (Ephesians 6:12)
Be self-controlled and alert. Your enemy the devil prowls around like a roaring lion looking for someone to devour. (1 Peter 5:8)
As we seek to live for the Lord the devil is going to actively seek to derail us. As we try to share the gospel with others the Devil is going to try to frustrate our attempts.
The Bible tells us that Satan loves to masquerade as an Angel of Light (2 Cor. 11:14). In other words he loves to pretend to be something that he is not. And he loves to plant those in the world who look enough like the real thing to lead others astray. The Bible warns us to beware for,
False Christs or False Saviors (Matthew 24:4-5)
False Apostles (2 Corinthians 11:13)
False Ministers (2 Corinthians 11:14-15)
A False Gospel (Galatians 1:6-12)
False Prophets (2 Peter 2:1)
False Doctrine (Hebrews 13:9)
False Miracles (2 Thessalonians 2:7-12)
Look around at the false religions around us. They all sound pretty good. They use spiritual language, they talk about love, they proclaim that we are brothers . . . .but they are seeking to move us away from Christ. Satan is a good counterfeiter. He is able to produce people who look very much like a believer,
They use Christian terms
They are nice people
They adopt Christian practices (like the sacraments)
They get involved as leaders in churches
They have great Christian experiences (In Matthew 7:22 we are told that some unbelievers have cast out demons, prophesied and performed miracles)