Mistake most Christians make 1.

The earlier Christians stop aimless fight with the wrong weapon and to the wrong person the better for us,
Christ we follow did not use any holy ghost fire to burn any one or spirit, he even caution his disciples who attempt to use it. It's only with the word of God that gives you boldness to victory not fighting like coward who is afraid.
You should speak authoritatively "devil get out!" and he obeys just like the drama during the temptation of Jesus, if it were the present day Christians they would have rained brim stone on the devil.
N/B you can't kill the devil it's on its own assignment, imagine what Christianity would be like with the devil on earth?  It's must be here tempting, trying us so that we will prove good workmen unto God