If you study the Bible sin is disobeying God.
Missing the mark set by God.
Disobeying God means disobeying the 10 commandments God gave to us to Follow.
No. The 10 commandments were given specifically to ancient Israel under a covenant which was broken. It no longer applies to anyone, although it is a good idea to use it as a rule of thumb, it is no longer under law and never was to anyone outside of Israel. Not only that but it didn't exist for a long time. All of the evil that existed to such an extent that Enoch asked God to take his life couldn't have sinned because there was no Law or Commandments until much later.
Those who do not follow them will not be saved.
Wrong.
Jesus was sent in the likeness of sinful man. Romans 8:2
Sorry, but that doesn't even make sense to me. How do you get that out of
Romans 8:2 or anywhere in the Bible. It's difficult to argue in that it is so ambiguous, but at the same time so easy to argue with in that it is so obviously not true in any sense that I can see. To say sin is flesh isn't correct for reasons I've stated. Satan and the demons have sinned, they aren't flesh, Adam was flesh before he sinned, Jesus didn't sin he took the sin of man. Man is currently under sin but that will be taken away. It already has been but not in effect. The Bible teaches resurrection which is flesh without sin. Man is sinful and Jesus was a man, but he was without sin, he foreshadowed being flesh without sin. Jesus was in the likeness of Adam prior to Adam's sin, not after it.
For the law of the Spirit in Christ hath made me free from the law of sin and death. 3 For what the law could not in that it was weak through the flesh. God sending is own SON in the likeness of sinful man, and for sin. condemned sin in flesh.
Sin in flesh, not flesh itself. You seem to be using sin and flesh as synonymous. There is a contrast between the spiritually motivated and the materially motivated, or fleshly and spiritually, but they are not absolute. The spiritual isn't necessarily without sin and the flesh isn't necessarily sinful. Eating is a fleshly or material concern but it isn't sinful.
Those who follow God and obey God are no longer a slave to sin.
But they are still sinners, they are still under inherited sin, until death. (Romans 6:7) Even with Jesus we aren't acquitted, or freed from sin until we die.