Read: John 3:16-36
For God did not send his Son into the world to condemn the world, but to save the world through him. (John 3:17)
This verse is a great guideline as to how we ought to talk about the gospel to people who do not know God, to those who are living careless, indifferent, often sinfully wretched lives. We ought not to come shaking our finger at them, pointing out how terrible they are and what evil things they are doing to themselves. We ought to come sensing the agony, the hurt, the inward shame, the loneliness, misery and anguish they are going through. That is the way God feels and that is the way we should feel too.
Paul puts this very beautifully in his second letter to the Corinthians: God was in Christ reconciling the world to himself, not counting their trespasses against them, (2 Corinthians 5:19). That is why in every vignette we have of Jesus in the gospels, where he is dealing with acknowledged, open, blatant sinners, we never hear a word of condemnation. Witness the woman at the well of Samaria. She had five husbands and was now living with a man outside of marriage. Jesus was courteous to her. He did not attack her, blame her, or judge her. There is no condemnation.