Truly, if we are not keeping the commandments of God, we ought to question as to whether we have truly been born again (1 John 3:4,9).
But I would say that if we are born again, we can blow it without that destroying our identity that we are righteous in Christ.
For it is written that God justifieth (declareth to be righteous) the ungodly (Romans 4:5).
If we have the identity that we are righteous, let us live by that identity (1 John 3:7, Romans 5:19, Matthew 5:6).