I'm not accustomed to reading the Institutes or the Westminster Confession.
False traditions of men.
Romans 3:This righteousness from God comes through faith in Jesus Christ to all who believe. There is no difference,
Phil 3:. 8What is more, I consider everything a loss compared to the surpassing greatness of knowing Christ Jesus my Lord, for whose sake I have lost all things. I consider them rubbish, that I may gain Christ 9and be found in him, not having a righteousness of my own that comes from the law, but that which is through faith in Christthe righteousness that comes from God and is by faith. 10I want to know Christ and the power of his resurrection and the fellowship of sharing in his sufferings, becoming like him in his death, 11and so, somehow, to attain to the resurrection from the dead.
Romans 10:Christ is the end of the law so that there may be righteousness for everyone who believes.
We become slaves(servants) to Christ..HE is our righteousness,so that God gets the glory