If you want to be His people you need only put your faith in Christ and His accomplished work on the cross.
While he yet talked to the people, behold, his mother and his brethren stood without, desiring to speak with him.
Then one said unto him, Behold, thy mother and thy brethren stand without, desiring to speak with thee.
But he answered and said unto him that told him, Who is my mother? and who are my brethren?
And he stretched forth his hand toward his disciples, and said, Behold my mother and my brethren!
For whosoever shall do the will of my Father which is in heaven, the same is my brother, and sister, and mother. Matthew 12:46-50
The Word of God Himself said this; He is the authority on the Law. What is the will of His Father?
Come now, and let us reason together, saith the Lord: though your sins be as scarlet, they shall be as white as snow; though they be red like crimson, they shall be as wool.
If ye be willing and obedient, ye shall eat the good of the land:
But if ye refuse and rebel, ye shall be devoured with the sword: for the mouth of the Lord hath spoken it. Isaiah 1:18-20
That is from the Most High God Himself.
There is no longer a separation between Jews and Gentiles and we are no longer slaves to the law.
Be that as it may, it still doesn't change the fact that those who are obedient to the Most High God are His people. Everyone else is everyone else. There was never such a thing as "slavery to the Law" to
obedient, holy entities like angels, because the Law of the Most High God is not conditional, and is as natural as the elements - even more so, because it is what created the elements themselves.
Compare it against the Most High God, and the Word of God Himself: when and where did either say that the Law was null, void, or only for a select group of people
who are not His people. Faith without works is dead.
God is the same as He was in the past and future.