Paul told the Gentile church in Corinth Christ is our Passover, and to keep the feast.
Paul was not commanding his followers to perform the rituals of the Jewish Passover feast. That would contradict his entire ministry.
To be clear, my comments were confined to the rituals of Passover, not the symbolism of it. We who are in Christ partake of the substance all day every day. In Him we are the Passover and as such we ought have no fellowship with wickedness. The application of what Paul is teaching there is given in the verses immediately preceding and following the passage you pluck out of its context....
I Corinthians 5:1 It is actually reported that there is sexual immorality among you, and such sexual immorality as is not even named among the Gentiles—that a man has his father’s wife! 2 And you are puffed up, and have not rather mourned, that he who has done this deed might be taken away from among you. 3 For I indeed, as absent in body but present in spirit, have already judged (as though I were present) him who has so done this deed. 4 In the name of our Lord Jesus Christ, when you are gathered together, along with my spirit, with the power of our Lord Jesus Christ, 5 deliver such a one to Satan for the destruction of the flesh, that his spirit may be saved in the day of the Lord Jesus.
9 I wrote to you in my epistle not to keep company with sexually immoral people. 10 Yet I certainly did not mean with the sexually immoral people of this world, or with the covetous, or extortioners, or idolaters, since then you would need to go out of the world. 11 But now I have written to you not to keep company with anyone named a brother, who is sexually immoral, or covetous, or an idolater, or a reviler, or a drunkard, or an extortioner—not even to eat with such a person.
Just like Corinth and Gentile morality was as linked together as they could possibly be.
The Corinthians were Gentiles!
It was known for prostitution, and that's saying something in the Apostolic era, because all the cities were known for prostitution, compared to anywhere else. Corinth was known for prostitution, even among cities known for prostitution.
Silliness. Who teaches you this vapid crap?
It wasn't Corinth that Paul is talking to or about. Paul was talking about Corinthians who were "named a brother" (Verse 11). Paul wasn't worried about "the sexually immoral people of this world" in this letter but about how the church at Corinth was letting this "leaven" into their congregation and tolerating it.
Passover, Unleavened Bread, and Firstfruits. Then Day of Atonement because Hebrews says it was when He entered Heaven, and then 10 days later Pentecost. Just leaves Tabernacles and Trumpets.
With this, I have no major argument. There are details, however...
When the fullness of the Gentiles has come in, God will turn back again to Israel (Romans 11:25-26) and fulfill Daniel's 70th week which includes Christ fulfilling Tabernacles, Trumpets and the Day of Atonement.
Yes, to some degree Christ has already fulfilled both Tabernacles and Atonement but there will be a further and fuller fulfillment. John 1 teaches that God became flesh and dwelt among us. The word "dwelt" there is not the normal word for dwelling. It is "tabernacled". John was clearly making reference to the Feast, but Christ is not just the fulfillment of the feast, He is the thing the feast was always pointing to, first in His incarnation, and ultimately in His permanent dwelling with His people.
Revelations 21:3 Behold, the tabernacle of God is with men…
The Day of Atonement has been entirely fulfilled in terms of redemption. That work is quite finished and nothing can be added to it. The only sense in which there is a fuller fulfillment of the Feast is when Israel accepts Christ as their King and is thus redeemed as a nation.
One final point. These Feasts were all given to Israel as a part of the law and they are also all prophesies. This places them firmly within the purview and ministry of the previous dispensation. Paul's gospel of grace was not prophesied but was instead "hidden from ages and from generations" (Colossians 1:26) and “not made known to the sons of men in other ages” (Ephesians 3:5). This is the sense in which I stated before and restate here that Passover observance hasn't anything to do with Paul's gospel. They are symbols of the substance we now enjoy,
nothing more, which your Catholic doctrine directly and explicitly contradicts and outright denies. We are not to return to the beggarly things of the law...
Galatians 4: 9 But now after you have known God, or rather are known by God, how is it that you turn again to the weak and beggarly elements, to which you desire again to be in bondage? 10 You observe days and months and seasons and years. 11 I am afraid for you, lest I have labored for you in vain.