Does righteousness come from law or faith?

In the book of Genesis 15:6 the bible states that Abram believed God and it was counted unto him as righteousness. God has just spoken to Abram about His promises for his life. We all know that God led Abraham about, looking for a city whose builder was God. But Abraham did not know where He was going. He just obeyed the voice of the Lord and went. Through this journey God brought His promises to p in Abraham's life, even changing his name as you can see. God's work in Abraham's life displayed a profound picture of how God works in our life. Abraham was a liar, yet he was chosen to fulfill God's purposes. He(Abraham) even ped this on down to Isaac, and Jacob. Yet, he was God's friend. Where I'm taking this, is I see so many Christians that put this dilemma out there for people to either conquer their sins or get on down the road. Either obey God's Word or split hell wide open. The sad truth of it is, is that we Christians are totally powerless against the sin nature that dwells within us. But to God be the glory, a way was made. When Christ died on that old rugged cross, freedom was purchased. You see, we don't just get holy and sanctified the day we get saved. We get justified by the cross of Christ, His shed blood at Calvary. But when we receive the Holy Ghost, the work of sanctification begins. But He doesn't say, okay Jesus did His part at the cross, now you have to do your part. It's this belief that have destroyed people, burned preachers out, discouraged the sinner from repentance. When believe what God has to say about us, it is counted unto us as righteousness. When we say I believe He died for me and that my righteousness is in Christ, God imputes unto us. Yet as we walk in willingness and obedience to the voice of the Holy Ghost, he will begin to establish the Word, or as some of you like to call it, the law, in our hearts. But He doesn't make whatever sin the focus, He leads us through things that will cause us to experience revelation in the Word. When He builds God's Word into us, that sin nature is being tore down. Because you shall know the truth and the truth shall make you free. How are we to really learn the truth, without the Spirit of truth revealing unto us. So, if our sin nature is being crucified by the Spirit sanctifying us through the Word, then we find that just like Jesus, who was the Word in the flesh, there will be longer anything in us to respond to temptation. No lust to bow to, that is. But at anytime we think we need to do "our part" we block the Spirit's ability to move in our life. For He can only operate by means of the cross. The cross is what gave the Holy Ghost the legal rights to live inside of us. So then, it is the cross that justifies and the Spirit that sanctifies. It is our complete reliance in that cross continually, not just when we got saved, but now, today, that will bring victory over sin in our life.