We are not told to fight the devil, but to resist – and resistance requires God’s Word. See the example of Michael the Archangel in Scripture:

“Yet Michael the archangel, when contending with the devil he disputed about the body of Moses, durst not bring against him a railing accusation, but said, The Lord rebuke thee.” (‭‭Jude‬ ‭1:9‬)

God’s Word changes lives.