There is a long history in Christianity of not understanding Grace - specifically the once and for all time covering for sin and forgiveness of it.
As a result when we sin there is a tendency for believers to feel disqualified again, with a need to repent and be restored to the Lord.
However, that is not the case at all. As a matter of fact sin is a non-issue for the Lord because of His perfect finished work. There is no condemnation to them who are in Christ Jesus. We have passed from death into life and that life is eternal and abundant.
So what should then be our reaction to be sin? Ignore it? Condone it? Accept it?
No.
Sin has consequences in this life. Shame. Sickness. Poverty.It is stupid to sin. Don`t do it.
But we are saved by Grace through Faith in Christ Jesus alone. We are His workmanship and those who are His will be perfected at His coming.