Christ Blood will cover all of our short comings. With out Christ no one stands but through Christ and Jesus being by your side, we will stand before the Father and His blood will keep us safe and in Right Standing.
Didn't Adam do that?
Adam thought that right and wrong could be decided by him rather than God. That's exactly what eating of the tree of knowledge of good or evil meant. In doing so, Adam rejected God as the source of righteousness (or rightness) and truth, making himself the source or origin. In doing that, his relationship with God was cut, and Adam died spiritually.
Death entered the created realm.
So no, standing in our own righteousness means dumping God's.
Yup, a useless bunch because we were never created to live apart from God. Dead people are pretty useless, and that is exactly what we are without God living inside of us...dead to everything pertaining to God.
I guess the only way the Lord God is going to show us throughout all the ages what he has planed for us would be by his "grace" in his "kindness" in Christ Jesus. If it has anything to do with grace then it is because of something we are not worthy enough to have by our own power, apart from Christ being our righteousness. I suppose this was the only way a imperfect being (us) can live inside of a perfect being (God).
Eph 2:5 even when we were dead in our trespasses, made us alive together with Christ—by grace you have been saved—
Eph 2:6 and raised us up with him and seated us with him in the heavenly places in Christ Jesus,
Eph 2:7 so that in the coming ages he might show the immeasurable riches of his grace in kindness toward us in Christ Jesus.