Is it Evil or Sinful?

Regarding my post on evil on Tuesday, I was asked how I would define the difference between evil and sin. As I said in that post, I define evil as an action or experience which we perceive in a negative way. Sin is a bit trickier, but not much once you deconstruct it a little. As most Christians are no doubt aware, “sin” literally means to “miss the mark.” From what I can tell, to sin is essentially to fail to be perfect at something, so if I am playing golf and fail to get a hole-in-one on every shot I have technically sinned. From a theological perspective “sin” would be simply failing to do something God wants me to do or doing something God doesn’t want me to do (not being perfect from His perspective, in other words). What makes this interesting is that something can be evil and not sinful at the same time, and vice-versa as well. For instance, if God tells me to kill a random person on the street it would be evil but not sinful for me to do so, and likewise it would be sinful but not evil for me not to do so. Let me know if that makes sense.