**No, he was totally defeated.**
Oh, his fate is sealed alright, but he has been a liar and deceiver since Adam walked the earth. And he is still the father of lies, and is still the MASTER deceiver (as Paul described him, “transformed into an angel of light”). Is he deceiving you?
His ability to have any effect in this world is solely through the will of man. That was true in the Garden and it is true now. If men were to cooperate with God’s Grace and lived a truly holy and sacramental life, keeping their souls washed clean in the Blood of the Lamb, then there would be no admittance for that scoundrel, and life on this planet would be full of virtue and evil would find no place here.