The new covenant is NOT like the prior covenant. AND the entrance is by faith in Jesus. The Spirit is not given by works of laws.
There must be laws/commands written on the hearts of the faithful for repentance of sin is a sign given for true salvation.
The gospel message to Jews wasn't to stop observing anything but that you need to go to Christ for Life. Christ is how God chose to forgive sin. The knowledge of salvation through the forgiveness of sin the ground work John the Baptist instilled in the people to prepare them for the one after him. The leadership hated Jesus and refused to repent for He had testified what they did was evil.
The gospel was first preached in a world with unrestrained sin and many false Gods.
Jesus to Paul
to open their eyes and turn them from darkness to light, and from the power of Satan to God, so that they may receive forgiveness of sins and a place among those who are sanctified by faith in me.’
And they were instructed such but not with circumcision or sabbath days or kosher foods or religious observances to meet requirements of law.
Do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived. Neither fornicators, nor idolaters, nor adulterers, nor [a]homosexuals, nor sodomites, 10 nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners will inherit the kingdom of God.
And its the same gospel message for all.