Sin is rebellion against God and profanes his holy name. He must deal with it. God’s wrath is his reaction against sin. In order to be saved, we must have the penalty paid, God’s just wrath must be satisfied. In addition, our relationship with him must be healed, we must be reconciled. Jesus does all of this through his sacrifice of atonement.
http://www.whatdoesthewordsay.org/podcast/117-jesus-christ…ice-of-atonement/