God can do no more than He has done. At the cross He judged the devil and overthrew him and his hosts.... Not only are we saved from sin on account of that death, but we are also saved from Satan.

Jesus taught His disciples to say when praying, "Our Father which art in heaven, Hallowed be thy name. Thy kingdom come. Thy will be done in earth, as it is in heaven." Now, if angels in heaven sinned, then God's will was not done in heaven.