1Peter 1:15-16 but like the Holy One who called you, be holy yourselves also in all your behavior; 16 because it is written, “You shall be holy, for I am holy.”
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Peter is referencing these Diaspora Jews back to the teachings in the Torah as a model for setting themselves apart as they were most certainly assimilated into the pagan customs and traditions of where they were dispersed to. Kosher food is referenced, but also teachings against mediums, adultery, sexual immorality, etc. If there was ever time for Peter to be very clear, he could have said to follow all these instructions with the exception of the foods, but he didn't.
Being holy has NOTHING to do with eating meat. therefore your "supports" are unsupportable when it comes ddiet.
Look what Paull said at the Jerusalem council:
Acts15:19 Wherefore my sentence is, that we trouble not them, which from among the Gentiles are turned to God:
20 But that we write unto them, that they abstain from pollutions of idols, and from fornication, and from things strangled, and from blood
His pronunciation to the Gentiles prohibited no sort of meat, be it from a reptile, or a pig or a dog. Since you are attempting to make the point that kosher eating is for the gentoles, then you must provede a single vese that says so. What you have done is to string a list of unrelated cherry-picked verses about being holy, and then try to superimpose them onto another unrelated subject. 20 But that we write unto them, that they abstain from pollutions of idols, and from fornication, and from things strangled, and from blood
Then in Antioch, there was a spat between Peter and Paul. Here is what Paul said about it:
Galatians 2:11 But when Peter was come to Antioch, I withstood him to the face, because he was to be blamed.
12 For before that certain came from James, he did eat with the Gentiles: but when they were come, he withdrew and separated himself, fearing them which were of the circumcision.
13 And the other Jews dissembled likewise with him; insomuch that Barnabas also was carried away with their dissimulation.
14 But when I saw that they walked not uprightly according to the truth of the gospel, I said unto Peter before them all, If thou, being a Jew, livest after the manner of Gentiles, and not as do the Jews, why compellest thou the Gentiles to live as do the Jews?
15 We who are Jews by nature, and not sinners of the Gentiles,
16 Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified.
The key is in red. Peter WAS living as a gentile among the gentiles. That means by definition that he did not eat kosher. He ate the "unclean" animals that nourished the gentiles,and gentile believers. 12 For before that certain came from James, he did eat with the Gentiles: but when they were come, he withdrew and separated himself, fearing them which were of the circumcision.
13 And the other Jews dissembled likewise with him; insomuch that Barnabas also was carried away with their dissimulation.
14 But when I saw that they walked not uprightly according to the truth of the gospel, I said unto Peter before them all, If thou, being a Jew, livest after the manner of Gentiles, and not as do the Jews, why compellest thou the Gentiles to live as do the Jews?
15 We who are Jews by nature, and not sinners of the Gentiles,
16 Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified.
Paul boldly scolds Peter for being two faced because when he was with the Jews, he reverted back to being a Jew.
At no time did Paul insist that Peter (or anyone else) eat kosher. For you or anyone else wanting to inflict that upon Christians, it is necessary for you to unequivocally demonstrate that God's desire is for gentiles to be kosher.
If that is not impossible, you should change your beliefs to conform with the Bible, not vice-versa, and have the Bible conform to your beliefs.