God is just and as a result will not ignor sin. It must be dealt with in all fairness. It must be judged and not just swept under the carpet. The Cross of Christ is where God's justice and mercy meet. 

Sin positions humanity in spiritual weakness. They are unable to correct the sinful nature they are born with. Because of God's love He chose to supply them a Savior. He sent His only Son into the human family to be a sacrificial substitute for them. Jesus the sinless Son of God took upon Himself humanities sin. He  endured physical death on their behalf paying in full the punishment for their sins. On the Cross Jesus did for us what we could never do for ourselves.

Because of Jesus' death on the Cross there is hope for all. Through Christ we can be saved from our sins.