I am not sure how you got that out of the verse I shared. God did forgive all sins on the cross. He reconciled himself to mankind through the blood of Jesus Christ. However, reconciliation is a two party process and man must reconcile himself to God. This is done through believing that Jesus died for our sins on the cross, was buried and rose again for our justification.
”And all things are of God, who hath reconciled us to himself by Jesus Christ, and hath given to us the ministry of reconciliation; to wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation. Now then we are ambassadors for Christ, as though God did beseech you by us: we pray you in Christ's stead, be ye reconciled to God. For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him.“
2 Corinthians 5:18-21 KJV