3 For though we walk in the flesh, we are not warring according do the to the flesh. 4 For the weapons of our warfare are not fleshly, but powerful through God to the overthrow of strongholds overthrowing reasonings 5 and every high thing rising up against the knowledge of God and leading captive every thought into the obedience of Christ. (2 Corinthians 10:3-5 translated from the NA28 Greek text)
All believers who are still in this life also live and walk in the flesh in a physical sense, but the goal must be to grow into maturity and no longer walk that way in a moral sense (Romans 8:4). Christians who are obediently doing this must actively war according to the spirit, never the flesh, in the battle to free souls from the forces of darkness and bring them to maturity in Christ (cf. 1 Corinthians 1:17-25; 2:1-4). Therefore, those whose ministries are based around appealing to the flesh are actually warring according to the flesh and that does not work, at least not in an eternal sense. What is done in the flesh may look impressive to those who walk in the flesh in a moral sense, but they are impotent and powerless to free souls from the forces of darkness and bring them to maturity in Christ. Why? They cannot successfully oppose satanic assaults on the gospel or any of God’s truths.