You have, without an ounce of proof, ASSUMED that saved Gentiles are from the ten northern Tribes. Your verses do not show this at all. ... Paul, to who is given the mystery of the Church, says in 1st Corinthians 8 that we MAY eat food dedicated to idols as long as there are no weak Christians around. Peter, James and co were "weak Christians"..
You may think lowly of Peter, however Christ Yeshua our Lord and Saviour, entrusted his the foundations of his Church, his Body of Christ to Peter, NOT TO PAUL. And Peter warns of those that twist the great Paul's words, to suit their own lawlessness, and Peter warns that we should not follow suit, lest to loose our own stability.
Matthew 16 (ESV)
15 He said to them, "But who do you say that I am?"
16 Simon Peter replied, "You are the Christ, the Son of the living God."
17 And Jesus answered him, "Blessed are you, Simon Bar-Jonah! For flesh and blood has not revealed this to you, but my Father who is in heaven.
18 And I tell you,
you are Peter, and on this rock I will build my church, and the gates of hell shall not prevail against it.
19 I will give you the keys of the kingdom of heaven, and whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven."
Acts 15 (ESV)
7 And after there had been much debate, Peter stood up and said to them, "Brothers, you know that in the early days God made a choice among you, that by my mouth the Gentiles should hear the word of the gospel and believe.
8 And God, who knows the heart, bore witness to them, by giving them the Holy Spirit just as he did to us,
9 and he made no distinction between us and them, having cleansed their hearts by faith.
10 Now, therefore, why are you putting God to the test by placing a yoke on the neck of the disciples that neither our fathers nor we have been able to bear?
11 But we believe that we will be saved through the grace of the Lord Jesus, just as they will."
2 Peter 3 (ESV)
10 But the day of the Lord will come like a thief, and then the heavens will pass away with a roar, and the heavenly bodies will be burned up and dissolved, and the earth and the works that are done on it will be exposed.
11 Since all these things are thus to be dissolved, what sort of people ought you to be in lives of holiness and godliness,
12 waiting for and hastening the coming of the day of God, because of which the heavens will be set on fire and dissolved, and the heavenly bodies will melt as they burn!
13 But according to his promise we are waiting for new heavens and a new earth in which righteousness dwells.
14 Therefore, beloved, since you are waiting for these, be diligent to be found by him without spot or blemish, and at peace.
15 And
count the patience of our Lord as salvation, just as
our beloved brother Paul also wrote to you according to the wisdom given him,
16 as he does in all his letters when he speaks in them of these matters. There are some things in them that are
hard to understand, which
the ignorant and unstable twist to their own destruction, as they do the other Scriptures.
17 You therefore, beloved, knowing this beforehand, take care that you
are not carried away with the error of lawless people and
lose your own stability.
18 But
grow in the grace and knowledge of our Lord and Savior Jesus Christ. To him be the glory both now and to the day of eternity. Amen.
The law is not abolished under the new covenant. Under the new covenant of grace, we are no longer in servitude to laws written on stone tablets under the law, but God's laws are written on our free will hearts and minds:
Hebrews 8 (ESV)
10 For this is the covenant that I will make with the house of Israel after those days, declares the Lord: I will put my laws into their minds, and write them on their hearts, and I will be their God, and they shall be my people.
Paul obeyed God's laws, and brought his specified offering to the temple:
Acts 21 (ESV)
26 Then Paul took the men, and the next day he purified himself along with them and went into the temple, giving notice when the days of purification would be fulfilled and the offering presented for each one of them.