There are generally three positions that are held by believers on Satan and demons. View 1) Do not believe that Satan, demons, and unclean spirits are real spirit beings, to them there is no such thing, not now nor was there ever. View 2) Believe that Satan, demons, unclean spirits are real spirit beings are still very active today. View 3) Believe that Satan, demons, and unclean spirits are real beings, but were all defeated and destroyed in AD 70 at the return of Christ when the judgment took place.
Paul says that this struggle is "NOT against flesh and blood." In the Greek this is literally, "blood and flesh." Is Paul saying this is not a physical battle but a philosophical one? That is the view of those who hold to view 1; they do not believe in a personal devil or demons, so this battle is not a spiritual one.
Paul is saying that their struggle is not with humanity, not with mere human power. So what is the struggle with?
View sermon transcript here: http://www.bereanbiblechurch.org/transcripts/ephesians/eph-06_10-12_spiritual-warfare-pt02_video.php
01/25/15 - Pastor David B. Curtis - Berean Bible Church - http://www.bereanbiblechurch.org - Message #742