The root of sin isn’t in breaking the law, but in breaking trust with God; with denying His loving, caring purpose in every command He gives. Before Adam sinned he broke trust with God – therefore God’s plan of redemption is centered on a relationship of trusting love – faith – instead of law-keeping. When we center our relationship with God on law-keeping instead of trusting love, we go against His whole plan.
It took a supernatural life-giving work to make Abraham the physical father of many nations, it also took a supernatural life-giving work to make him the spiritual father of many nations.
If God could call the dead womb of Sarah to life, he can call those who are dead in trespasses and sins (Ephesians 2:1) to a new life in Jesus.
All true believers, like Abraham, obey. Obedience is faith in action. You are to walk in the steps of the faith of father Abraham. His faith did not sit still, it took steps; and you must take these steps also by obeying God because you believe him. That faith that has no works with it is a dead faith and will justify no one.