Funny, I'm not seeing anything about a debate over the validity of kosher. All I see is an acceptance of the Gentiles.
Eisegesis much?
I agree, by the way, that the ceremonial purity and dietetic laws of the Old Testament played an important part in the economy of Salvation. They are prefigurement of Our Lady's purity.
They aren't, but if you believe they are, why don't you follow her example?
Also, Mary is not the Tabernacle, unless you're taking the position that post-Resurrection, Christ crawled back into her womb to make intercession for us (per Hebrews 9). The Tabernacle was a model of Heaven (as a comparison with Rev. 4-5 shows), not of Mary.
When was Sunday first celebrated as Resurrection Day?
If you're referring to the specific anniversary of the Resurrection, about 1500 years before the event, when God ordained the Feast of Firstfruits. If you mean, "When did Sunday replace the Sabbath?" Biblically speaking, the answer is never; historically speaking, there was debate on that point right up through the fourth century.
Looks like on one side we have Protestants who have the 'sell by date' of the Church was somewhere 100-400 AD and the Messianic Jews who have the 'sell by date' of the Church prior to even that.
The moment the Church said "it hath seemed good to the Holy Ghost and to us, to lay no further burden upon you", the kashrut was deprecated. It became a private habit of some Christians that they were free to have or not have.
Mary is not the Tabernacle, unless you're taking the position that post-Resurrection, Christ crawled back ...
Mary carried the Word to man. This is functionally the Tabernacle. After the Resurrection, she is in Heaven and the Tabernacle is on the altar. "It is consummated".
there was debate on that point right up through the fourth century.
Thank you. So, there was a debate and the Church settled it. "Whatsoever you shall bind upon earth, shall be bound also in heaven; and whatsoever you shall loose upon earth, shall be loosed also in heaven".