GINOLJC, to all. addressing the OP. there is the spirit of ERROR in your statements. Yes the the Lord Jesus came to save the lost sheep of Israel. the error is, WHO ARE THE LOST SHEEP. I notice you mention James 1:1, but you need to add 1 Peter 1:1 also. for all the strangers in the bibles are not only of the tribes of Israel. the Lord JESUS said the HOUSE, and not ONLY the tribes of Israel. listen to the record. Isaiah 14:1 "For the LORD will have mercy on Jacob, and will yet choose Israel, and set them in their own land: and the strangers shall be joined with them, and they shall cleave to the house of Jacob".
Strangers: H1616 גֵּר ger (gare) n-m.
גֵּיר geyr (gare) [fully]
1. (properly) a guest.
2. (by implication) a foreigner.
so now the question is "who is of the HOUSE of Jacob". watch the red. we have a carnal tribes, Israel, and a spiritual HOUSE Jacob. and now we have "Strangers". looking at the definition above, a stranger can be a guest, a foreigner. let the record speak. for now we will see who a stranger is concering GRACE and the LAW. Genesis 17:12 "And he that is eight days old shall be circumcised among you, every man child in your generations, he that is born in the house, or bought with money of any stranger, which is not of thy seed". stranger here is the Hebrew word, Stranger: H1121 בֵּן ben (bane) n-m. please look it up, which means "Son". now for a side note. for all those who believe that the sons of God mention in Genesis 6 are angels well Genesis 17:12 here proves that they are not angels. for H1121 בֵּן ben (bane) used here is the same word used in Genesis 6, as well in Job 1:3 "His substance also was seven thousand sheep, and three thousand camels, and five hundred yoke of oxen, and five hundred she asses, and a very great household; so that this man was the greatest of all the men of the east". see that word in red "men" of the east. it's the same word H1121 בֵּן ben (bane). just killing two birds with one stone, so to speak. but let's Continue . so the stranger in Genesis 17:12 unto Abraham is a spiritual. How do we know this. the covenant was with Abraham and his "SEED". Genesis 17:7 "And I will establish my covenant between me and thee and thy seed after thee in their generations for an everlasting covenant, to be a God unto thee, and to thy seed after thee". now let's hear the apostle paul concering this seed in Grace and the Law. Galatians 3:16-18 "Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ. And this I say, that the covenant, that was confirmed before of God in Christ, the law, which was four hundred and thirty years after, cannot disannul, that it should make the promise of none effect. For if the inheritance be of the law, it is no more of promise: but God gave it to Abraham by promise". and the promise is by FAITH. now, was not Abraham himself a stranger in the Land himself? look for a city not built with mortal hands. Hebrews 11:8 "By faith Abraham, when he was called to go out into a place which he should after receive for an inheritance, obeyed; and he went out, not knowing whither he went By faith he sojourned in the land of promise, as in a strange country, dwelling in tabernacles with Isaac and Jacob, the heirs with him of the same promise: For he looked for a city which hath foundations, whose builder and maker is God". he was a sojourner. well let's see who a sojourner is. listen to the record, Isaiah 14:1 "For the LORD will have mercy on Jacob, and will yet choose Israel, and set them in their own land: and the strangers shall be joined with them, and they shall cleave to the house of Jacob". the house of Jacob is a house that contain strangers, and it was Jacob who inherent the Promise that was many unto his father Issac, which was made unto his father Abraham. now knowing that it is by FAITH that the promise was made. and is not Abraham the father of MANY NATIONS/G1484 ἔθνος ethnos (eth'-nos by FAITH. yes the Gospel was hidden. why do you think they are called the "LOST", be it tribes, or People, for all must hear the gospel. Luke 19:10 "For the Son of man is come to seek and to save that which was lost". all men are lost, got to start some where.
PS, side note. concering the Law, it's not for the faithful who are righteous. and yes the the Law still in effect, but not for the righteous. scripture, 1 Timothy 1:9 "Knowing this, that the law is not made for a righteous man, but for the lawless and disobedient, for the ungodly and for sinners, for unholy and profane, for murderers of fathers and murderers of mothers, for manslayers, For whoremongers, for them that defile themselves with mankind, for menstealers, for liars, for perjured persons, and if there be any other thing that is contrary to sound doctrine". oop's contrary to sound doctrine. yes your doctrine need to be correct. if not you will have to face the LAW, which was MADE FOR YOU. other words if you don't have sound doctrine, (the truth), then you're still a sinner". don't argue with me, read the record, "but for the lawless and disobedient, for the ungodly and for sinners".
be blessed