It is not a sin to be tempted. It is a sin to succumb to it.
Yep. This is why God told Cain he MUST master sin. We do not HAVE to sin. Even though we are susceptible to sin because of the fall of Adam and Eve, we are not HELPLESS before it. We have the Grace of God to help us stand up to it, and we have Confession to help us deal with it.