A brief response John - responsibility and accountability can only be meaningful between two equal parties and an ability to enforce in some manner judgments regarding an unwanted outcome.
On a general note, God took on all “responsibility” for all causes and our limited view of moral accountability when His Son took on the attributes and weaknesses of human beings, and without performing an irresponsible or immoral act, was willing to suffer and unjust death at our collective hands.
If this were a two party dispute, we should be held accountable. However, since God is God, we understand it as an act of Grace. It would be correct to indicate that we have a good idea from this on what we may consider as divine action.