Are you committing a mortal or venial sin if you break one of the Commandments? Let me know if you also keep all of the Mosaic Laws listed in Leviticus. You do keep all of them, don't you? You are still under the yoke of the law, aren't you?
It's all spelled out there in the link I posted to you. And ALL of it is based on the Ten Commandments.
Of course Christians fail, miserably sometimes. But the sign of a true Christian is his discomfort with his sin. He has the Holy Spirit who convicts him when he sins. Sanctification is a process. But is not a dealer installed option that you can take or leave when you pick up your free gift of justification. Those God justifies He also sanctifies. Perfection won't come until heaven, but if you are not being sanctified -- that means corrected like a son when you sin -- then you had better re-examine your definition of faith. Faith is invisible but like the wind, we can see its evidence.
And sancification is not works. It is God at work in you to will and work for His good pleasure. You are no longer your own when you are a Christian. You've been bought with a price and He WILL make you into a new creature. Old things pass away. All things beocme new. You will fail. You will be convicted, disciplined, and you will grow and learn. Not until heaven will we be truly made over into His image, for only then will we be able to see Him as He is -- fully. But the process begins here as evidence of our faith and as a witness to the lost.