B-A-C,
This is an oddly worded question, but the Bible makes in clear the flesh is perfectly capable of sinning even without any help from Satan.
The reason man "after Adam" sins is because they were sold over to sin in the flesh, sin became their nature and Satan became their god.
Ephesians 2:2
Wherein in time past you walked according to the course of this world, according to the prince of the power of the air, the "spirit that now works" in the children of disobedience:
Christians can also allow themselves to be blinded if they refuse to do what God word says. Revelation knowledge comes through doing God's word because only God gives understanding and exalts the believer that walks upright in Him believing His word.
2 Corinthians 4:3
But if our gospel be hid, it is hid to them that are lost:
2 Corinthians 4:4
In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them.
We can see on this forum that one believer thinks another is blinded to God's word all the time. This makes the believer thinking another is blinded, blinded himself according to God's word by the judgment made by his statement. This is deception of the devil when a person is blinded. A believer can only sin when they are tempted. Temptation (according to scripture) comes from the tempter.
Rom 7:14; For we know that the Law is spiritual, but I am of flesh, sold into bondage to sin.
Rom 7:25; Thanks be to God through Jesus Christ our Lord! So then, on the one hand I myself with my mind am serving the law of God, but on the other, with my flesh the law of sin.
1 Pet 3:18; For Christ also died for sins once for all, the just for the unjust, so that He might bring us to God, having been put to death in the flesh, but made alive in the spirit;
In fact there a several verses about putting the flesh to death. (Not our physical bodies, but rather our non-spiritual desires).
Every believer's body in Christ died with Him. Jesus circumcised the flesh of man by representing and crucifying the flesh. Just as through Adam's sin begot selfishness in the flesh and came alive, the flesh was crucified by Christ's work on the cross and believers benefit if they believe. If not they will be smacked around spiritually, mentally and emotionally.
Colossians 2:11
In whom also you are circumcised with the circumcision made without hands, in putting off the body of the "sins of the flesh" by the circumcision of Christ:
When Romans 7:14 talks about being sold over or into bondage to sin, it's talking about sold over to Satan's Kingdom. Thank Jesus we are no longer in that nature. Sin doesn't have a Kingdom a person can be sold into, Satan does.
Romans 7:25 is also talking about Satan's Kingdom - and the sin he is speaking about serving is Satan through emotions. Paul in mind and understanding is serving God by being led by His word. Satan was using emotional warfare against Paul. That's why Paul said, "it's not me, but Satan/sin dwelling in me." But we know Satan is the tempter that is making Paul do things he doesn't desire to do through the pressure of emotions; which is the pressure of tribulation (Rom. 7:20).
Romans 7:23
But I see another law in my body, warring against the law of my mind, and bringing me into captivity to the law of Satan which is in my body.
We know Satan is not "IN" a believer according to Romans 8:9; but Christ now resides in the hearts of believers. The other law that Paul is experiencing is temptations through emotions (feelings). Paul doesn't have full clarity in this fight, but he thanks Jesus because he knows God is sufficient for him.