Are Followers Of Christ Truly Immune To Sin?

It is true even a Christian still struggles with sin as no one is immune to sin since we live in a fallen world but the only thing different between a Christian and an unbeliever is that a Christian is not supposed to sin willfully and when a Christian does sin the Holy Spirit convicts him or her of their sin and they ask for forgiveness and therefore even though a Christian still struggles with sin they are not a slave to sin as they are slaves to Christ for the Bible says that whatever a man is obedient to that is what he is a slave to either he obey Christ and therefore is a slave to Jesus Christ or he obey sin and therefore is a slave to sin. Even if an unbeliever does not want to be a slave to sin (like for example if a unbeliever is a slave to lust or gluttony) and he does not want to be a slave to that specific sin anymore but still do it it is no longer him who does it but it is sin that forces him to do it as sin has become his slave master. You see people sin is a cruel master it will rob you of your peace and joy and the only way to truly overcome sin and not be a slave to sin is to repent and turn your life over to Jesus Christ for he is the Prince of peace and he will set you free from the bondage of sin for the truth will set you free and Jesus Christ is the truth and the light of the world.