Are you aware that, according to the Law, there is really no such thing as big and small sin when it comes to justification? All of us are willfully sinning without even realizing it. According to the Law,
What is not of faith is of sin Romans 14:23
If you know what is good and you don't do it, that is sin James 4:17
Any husband here loves his wife as Christ love the church?
Any wife loves her husband until she reverence him? Ephesians 5:33
That is sin, and we commit sin every day in so many ways. We tend to think in terms of big sins and little sins, but according to James 2:10 For whosoever shall keep the whole law, and yet offend in one point, he is guilty of all.
So if you want to be strict about it, everyone of us are a slave to sin under the Law, if you define sin as a verb.
Fortunately however, Paul taught us that it is sin as a noun that we have died to, and we are no longer under Law. When you are no longer under the Law, sin cannot be imputed to you.