Yes, we can agree on this. God is powerful enough to totally pull the plug and stop the whole game completely. It all continues because He allows it.
I actually think the W. Confession is accurate in saying that "God is not the author of evil." By that, I think it means "the first primary proponent." God did create, and one could say, "Given foreknowledge that means God is directly liable." Given that the alternative is no existence for any of us if He hadn't created, then we need to answer how (1) evil can exist, and (2) God is not the author of it.
I find my answer in the grant of free choice to His creatures, but you might not. In either case, we agree that God is not the author of evil.
Why?
Why not just believe that God is not a man, that he should lie; neither the son of man, that he should repent: hath he said, and shall he not do it? or hath he spoken, and shall he not make it good? (Numbers 23:19)