That is not biblical as the bible clearly states that if you continue in willful sins then you are not a true born again believer, and a son of God. And then Paul gives an example of the Galatians who turned from God to going back to a life of sin, which in their case was to be justified by the law. Paul clearly tells them Christ has become of no effect (no remission of sins) to them, and they have fallen from grace. No remission=no salvation, no grace=no salvation !!!
It is that simple, and the scripture you give from Hebrews is after repentance and confession is made for your sins to receive remission of them. You do not get remission automatically before repentance, baptism, or confession is made for them. And the laws there that he is talking about is God's moral laws, not the 613 Mosaic laws....
Lets use the whole chapter in Hebrews 10 to get the full context, as you can not go with the part you gave with out also paying attention to this that follows;
Hebrews 10:19
Therefore, brothers and sisters, since we have confidence to enter the Most Holy Place by the blood of Jesus,
Hebrews 10:22-25
let us draw near with a true heart in full assurance of faith, having our hearts sprinkled from an evil conscience and our bodies washed with pure water.
(^....Repentance and baptism.....^)
23 Let us hold fast the confession of our hope without wavering, for He who promisedis faithful.
(^....Staying firm in the faith and not falling away......^)24 And let us consider one another in order to stir up love and good works, 25 not forsaking the assembling of ourselves together, as is the manner of some, but exhorting one another, and so much the more as you see the Day approaching.
^^^We are to stir up good works to be done, not tell others not needed and don't worry you can do whatever you want.