YHVH was not given to Israel alone. There was one law for everyone, including the nations.
King James Bible
Ye shall have one manner of law, as well for the stranger, as for one of your own country: for I am the LORD your God. Lev. 24:22
Most Christians keep nine of the ten commandments for example. And as for most of the laws given to Moses that apply to us today, most Christians keep. Love is the essence of the law.
You can't pick and choose which Old Testament laws to follow. You either follow all of them or none of them.
(Matthew 5:18 NIV) I tell you the truth, until heaven and earth disappear, not the smallest letter, not the least stroke of a pen, will by any means disappear from the Law until everything is accomplished.
UNTIL EVERYTHING IS ACCOMPLISHED. It was accomplished on the cross when Jesus was crucified. We are no longer under Old Testament law.
The laws are divided into groups. Some apply only to women, some to mature women, some younger women, some men, some for the temple, the priests, Levites, and so on. At the end of many laws are the words, that we are to do that for ALL our generations. We are not UNDER the law, but out of love we obey His commands. He is the same yesterday, today, and forever.
ONE EXAMPLE
King James Version
Exodus 31:16
Wherefore the children of Israel shall keep the sabbath, to observe the sabbath throughout their generations, for a perpetual covenant.