These people could be referred to as “awakened, but not alarmed.” Explain that God is forgiving—but only to those who repent of their sins. Ask him, “If you died right now, where would you go?” If he says, “Hell,” ask if that concerns him. If it does concern him, ask, “What are you going to do?” Then tell him that God commands him to repent and trust the Savior. If it doesn’t concern him, speak of the value of his life, the threat of eternal damnation, and the biblical description of hell. Caution him that he doesn’t have the promise of tomorrow, and plead with him to come to his senses.
“Almost persuaded to be a Christian is like the man who was almost pardoned, but he was hanged; like the man who was almost rescued, but he was burned in the house. A man that is almost saved is damned.” -Charles Spurgeon