Most Christians rely of their sanctification (how well they are doing and living and performing as Christians) for their justification (who they are in Christ):
"Only a fraction of the present body of professing Christians are solidly appropriating the justifying work of Christ in their lives… Many… have a theoretical commitment to this doctrine, but in their day-to-day existence they rely on their sanctification for their justification… drawing their assurance of acceptance with God from their sincerity, their past experience of conversion, their recent religious performance or the relative infrequency of their conscious, willful disobedience. Few know enough to start each day with a thoroughgoing stand upon Luther's platform: you are accepted, looking outward in faith and claiming the wholly alien righteousness of Christ as the only ground for acceptance, relaxing in that quality of trust which will produce increasing sanctification as faith is active in love and gratitude…