Our Heavenly Father knows how to bring sinners to heaven, therefore let none avoid turning to Christ out of fear that he will not be able to complete the work he has begun.
There is no other provision for sin than the blood of Christ and at no point does the believer cease to need it. God is in the process of bringing sinners to heaven. It is his will that although we are justified in a moment, our sanctification is not complete until death, and sin continues to harass us to the end. There must therefore be a remedy for sin along the way, even for believers, and this God has provided, because the blood of Christ not only washed us clean at the start of our Christian lives, but remains the only means by which daily sin can be washed away.