In terms of judgement and mercy, sin and punishment, I think we often think of God as Janus; the Roman god of transitions. Janus is usually depicted with an angry face on one side and a happy face on the other. It's a flip of the coin to see which one you get.
God isn't a god of chance, of war and peace. There are things He emphasizes, things He whispers and things He thunders about. Each expression is of Him, yet some things are more important than others. God isn't messy or confused, but often our perception of Him is.
Most of us seem to think that judgement and sin are things that He screams. I feel that with judgement, it's a thing that He is both rational and sorrowful about. Rational in that there must be a consequence for certain things, and sorrowful that our choices can bring us pain.
What we don't seem to get is that there is something that screams louder than anything. Mercy.
Mercy triumphs over judgement. Mercy is always bigger, louder, greater. Jesus as the atonement for sin. Jesus, punished with the sin of the world. That screams mercy.
There is a section in the book The Lion, The Witch and The Wardrobe that illustrates this well. Lucy and Susan had witnessed Aslan being killed in the traitor Edmund's place. They fell asleep crying and woke to discover He had come back to life. How was this possible? How could one overturn judgement?
"It means that though the Witch knew the Deep Magic, there is a magic deeper still which she did not know. Her knowledge goes back only to the dawn of time. But if she could have looked a little further back, into the stillness and the darkness before Time dawned, she would have read there a different incantation. She would have known that when a willing victim who had committed no treachery was killed in a traitor's stead, the Table would crack and Death itself would start working backwards."
What screams and whispers in our hearts when we look at ourselves or others? We can look like God in that we can identify sin and holiness, good and evil, but our response needs to be tempered like His is. With a Cross.