Bismillah
Yet they sinned. Their nature was sinful. They were also not "born." They never passed through a birth canal. Jesus did. Jesus is not like Adam in that sense because he was a fetus, a baby, a child, a teenager, then a man. Adam was Created as a man.
It was their sin that caused all the following humans to HAVE to bear the burden of that sin. Jesus was born after Adam, hence...