Nightmare, and others, please consider Romans 5
Death in Adam, Life in Christ
12 Therefore, just as sin came into the world through one man, and death through sin, and so death spread to all men because all sinned 13 for sin indeed was in the world before the law was given, but sin is not counted where there is no law. 14 Yet death reigned from Adam to Moses, even over those whose sinning was not like the transgression of Adam, who was a type of the one who was to come.
15 But the free gift is not like the trespass. For if many died through one man's trespass, much more have the grace of God and the free gift by the grace of that one man Jesus Christ abounded for many. 16 And the free gift is not like the result of that one man's sin. For the judgment following one trespass brought condemnation, but the free gift following many trespasses brought justification. 17 If, because of one man's trespass, death reigned through that one man, much more will those who receive the abundance of grace and the free gift of righteousness reign in life through the one man Jesus Christ.
18 Therefore, as one trespass led to condemnation for all men, so one act of righteousness leads to justification and life for all men. 19 For as by the one man's disobedience the many were made sinners, so by the one man's obedience the many will be made righteous. 20 Now the law came in to increase the trespass, but where sin increased, grace abounded all the more, 21 so that, as sin reigned in death, grace also might reign through righteousness leading to eternal life through Jesus Christ our Lord.
Death reigned prior to Moses receiving the Law, because men were imputed with sin through Adam, our federal head, even those who did not sin as Adam (infants possibly?). After the Law, sin increased, due to transgression of the law, so that grace could abound more. So, Adam's one sin act brought death and condemnation, and Jesus' one righteous act brought eternal life. So, after Moses, we became subject to the law ,and sin increased because of transgression of the Law. So, Drew is right to say it not only revealed sin, but in creased sin. Now, where there is no law (for the believer), under the New Covenant we have in Christ, sin is not imputed, but through grace we have justification and righteousness reigns.
I hope that's clearer for my part. As far as the believer's obedience to Christ, we have become disciples dying to oursleves and walking in the spirit, the law of grace, being conformed to His image by the Holy Spirit...with this transfromation, and with His love in us, we are compelled, literally created, to follow Him in good works and obedience to the Father.
Ephesians 2
1 And you were dead in the trespasses and sins 2 in which you once walked, following the course of this world, following the prince of the power of the air, the spirit that is now at work in the sons of disobedience 3 among whom we all once lived in the passions of our flesh, carrying out the desires of the body and the mind, and were by nature children of wrath, like the rest of mankind. 4 But God, being rich in mercy, because of the great love with which he loved us, 5 even when we were dead in our trespasses, made us alive together with Christâ€â€by grace you have been saved 6 and raised us up with him and seated us with him in the heavenly places in Christ Jesus, 7 so that in the coming ages he might show the immeasurable riches of his grace in kindness toward us in Christ Jesus. 8 For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, 9 not a result of works, so that no one may boast. 10 For we are his workmanship, created in Christ Jesus for good works, which God prepared beforehand, that we should walk in them.