And they were all saved, found righteous is God's sight, and justified. And, at least they had all the means necessary to fulfill the commands of the Law. Because it was given to them. Land, Produce, all the 'blessings', everything was all attainable to the patriarchs and their descendants. Through faith they operated the commands of the law that were given them by God. And each knew Yeshua, God their salvation.
But, quite the contrary for you. You have no means to accomplish even the least of the commands given Israel by God through Moses, because you have no land, no priesthood to function the temple, no temple, no promise of EVER receiving them because. Get this, they were not given to you!
Yeshua was given to all the world as a new covenant for the remission for all our sins under the first covenant. Jews and Gentiles, Israel and the nations. The command, by God, is to believe in His Son for the forgiveness of our sins. AND believe that he will come into our beings this very second and live, dwell, make his home in us. Where he continually day by day keeps, protects, and saves us from all our sins. Past present and future. The command is to receive eternal life, not laws that deal with sins and death. Our Lord, YOUR lord if he so be has overcome death, in this very moment. If you ...believe.
Yeshua brought life, eternal. More abundant life. Abraham saw his day and rejoiced. All the world will be restored. Not to laws that deal with sins and death, but to life more abundantly, eternal. The Spirit is given to restore this relationship between God and man. It's the first fruits of the Kingdom that is rising like the dawn.
What is abundantly clear about the OP text is it does not say, 'what counts is "following the laws given Moses"'. What is even more abundantly clear from the OP presentation is an ignorance about what the command of God actually is for us, through Yeshua.