Christians are sinners, but not of the devil
It was never the devils fault, that I - choose to make a decision be it by the flesh.
People use "insanity plea - or the devil made me do it", "it was the devil or demon in me." Which doesn't take in responsibility that really it was their own decision.
Say a person gets a phone call and she gets mad at the person, and there are other factors making your life hectic. That all of a sudden you are mad at the person who called you, and you take it out of your child by throwing them off the bridge you are walking on.
These types of things happen daily, people murder, kill, steal, manipulation, abuse, and all of us are capable of making decisions for ourselves and acting up our own desires without any need from the help of the devil, who has already been taken care of.
I do believe like "School spirit", that the spirit of hatred can be around, or the spirit of lust, or the spirit of manipulation, or the spirit of abuse, still exist in the world that compels us perhaps by our own decisions we make with-in our soul.
"Looking into a store as a child, and you see candy. Upon leaving your mother and dad are not looking and you are compelled by your desire to have that candy, you steal it. In the car on the way home, your mother and dad are driving, and you are in the very back seat of the car fixing to unravel the candy and your mom hears the crinkling, and the car comes to a halt by dad."
This is just the natural learning process for all of us as we grow up, some have good direction, some have bad direction either way it goes all of us have made mistakes, and even premeditated choices.
Where our heart is where our treasures are, be it on heaven or on earth. Our earthly passions by nature is what was mentioned before, lust, greed, hatred, manipulation, sexual pleasures, and the like, are all nature and not spiritual and not part of God. The Spirit brings forth peace, mercy, faithfulness, kindness, faithfulness, patience, long-suffering, and the like manner.