The Council approved pork and lobster sandwiches right after St. Peter spoke, so I would think they understood him better than you, not being there, did.
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.
When was Sunday first celebrated as Resurrection Day?
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.