The goal of the gospel is to save those who believe the gospel. (Romans 1:16) Those who have been justified by faith are sanctified/set apart/made holy in standing before God positionally in Christ. 1 Corinthians 6:11 - Such were some of you; but you were washed, but you were sanctified, (past tense) but you were justified in the name of the Lord Jesus Christ and in the Spirit of our God.The goal of the gospel is holiness.
Yet there is also progressive or ongoing sanctification in which the reality of that holiness becomes more and more evident in our actions, words, thoughts, attitudes, and motives. 1 Thessalonians 4:3-4, - For this is the will of God, your sanctification: that you should abstain (present tense) from sexual immorality; that each of you should know how to possess his own vessel in sanctification and honor.
So becoming washed, sanctified and justified in Christ is a one time event, yet abstaining from sexual immorality is not a one time event. The believer possess a positional, judicial standing of righteousness in Christ and, second, a remaining ongoing process of practical, progressive holiness in our actions, words, thoughts, attitudes, and motives.
Do you believe that you have completely stopped sinning? Do you claim to live a sinless, without fault or defect, flawless, absolute perfect life 100% of the time, exactly as Jesus lived? Is that your gospel? Live a sinless life or else you won't be saved?The gospel is pardon and power, forgiveness and restoration, cleansing/new life, etc. If we do not have the faith that will stop us from sinning, we do not have the faith that can be taken to eternal life.