Christians: when you use the word "evil" do you think of it as literally from the devil?

Here I go again with another Christian question. Rules are please no attacks on anyone, I am genuinely interested in answers from Christians with no judgements being made. This is just about understanding intent, content, a communications question of the meaning of the word.

On my facebook I wrote a status about the girls who finally escaped from being held captive for ten years by three brothers. It is hard for em to fathom three brothers all that sociopathic and sadistic. A friend of mine, who is a very relgiious evangelical Christian answered my question about the brothers in one word—evil.

I realize she might just be using the word in the every day way of just describing horrific behavior, but would you say many Christians actually think it is some sort of external force like the devil, and not a product of their minds?