For God did not send His Son into the world to judge the world, but that the world should be saved through Him. God wants to give us a better life beginning right now, plus an outstanding new life that begins after we leave this earth. Because of our human nature, we are all sinners. The word sin means that we miss the mark. Sin is anything that we do, or think, that is contrary to the character of God.
Sin is a part of our nature.
We sin by choice. We live a life that is not up to the standards that God sets for us. No one except the Lord Jesus, who was the perfect Son of God, is free from this desire to sin. We deserve death. Jesus is God.