Satan is not after non-believers, he already has them. He is after believers to put their “Lights” out, so that non-believers will remain in darkness.
Jesus said, “I have come into the world as a light, so that no one who believes in me should stay in darkness.” (John 12:46 NIV)
Jesus also said, “In the same way, let your light shine before men, that they may see your good deeds and praise your Father in heaven.” (Matthew 5:16 NIV)
Words are heard, not seen, while actions are seen, not heard. A light shines in darkness to show the way. Each believer is such a light. “Let your light shine.”