The Mosaic Law was Law for those who followed Moses…
Jesus fulfilled them… And now - and for Everyone - Faith in Jesus with the Guidance of God’s Holy Spirit - is the Way to Salvation…
This is a good answer.
I’d like to quote St. Paul in his epistle to the romans. In this passage, St. Paul compare our adherence to moses law to an analogy of married woman.
Romans 7
1 Do you not know, brothers and sisters for I am speaking to those who know the law, that the law is binding on a person only during that person’s lifetime?
2 Thus a married woman is bound by the law to her husband as long as he lives; but if her husband dies, she is discharged from the law concerning the husband.
3 Accordingly, she will be called an adulteress if she lives with another man while her husband is alive. But if her husband dies, she is free from that law, and if she marries another man, she is not an adulteress.
4 In the same way, my friends, you have died to the law through the body of Christ, so that you may belong to another, to him who has been raised from the dead in order that we may bear fruit for God.
5 While we were living in the flesh, our sinful passions, aroused by the law, were at work in our members to bear fruit for death.
6 But now
we are delivered from the law, dead to that which held us captive, so that we are slaves not under the old written code but in the new life of the Spirit.
Our secular law still use some of moses law principles. For example an eye for an eye: if one owe somebody $100 he need to return the same amount. But moses religuous observance, we no longer need to adhere to those.