There is no disputing that God has power over Satan or authority, but it seems, as I look around, that Satan is able to exercise his desires (has some authority) on the earth. We are able to choose to follow Satan, as God gave us free will, so do you suppose that Satan is unable to lead?
Satan certainly has power, but that is clearly not absolute even over earthly matters. Did he just happen to take Election Day off in 2016?