I always go back to Paul in 1 Corinthians 4, that even though he's not aware of any sin, that didn't mean, in his mind, that he thought he was sinless.
Paul came to this conclusion.
"Christ always gives me the Victory".
Paul said..>"as many as be PERFECT"......
So, that is not anything less than to be so.
Christ was TEMPTED, as we are..
This means He had THOUGHTS that were temptations........
This didnt keep Him from being sinless.
So, there is our mind that has to be renewed, and in this mind can be found all sorts of devilment.
Your spirit is born again, but your mind isn't.
You have to RENEW it.
We are not our mind, we are our SPIRIT.....which is become a "New Creation", and this is as sinless as God, as its His Righteousness that we have become.
How can we be "ONE WITH GOD" and be a "sinner"?
How can we be "in Christ" and be a sinner?
If you are taught you are a sinner and you are born again, then you are listening to a heretic.
We are not what we use to be, we are become what God has recreated us to become.....which is a New Creation.
If a believer has thinking issues, or has self control issues, then that is all it is........its not who they are, its only the artifacts and the sin consciousness that is found when a person does not have a renewed mind and is walking in the Spirit.
You probably recall that Satan was cast out of Heaven, because INIQUITY was found
IN HIM.
So, if we have sin
IN US, as justbyfaith teaches, and Satan was cast out of heaven for having sin in him, then what does that tell you?