I enjoyed your post and thought it was dead on concerning how Christianity have imposed worship days despite the belief that they were done away with.
However a careful reading of scripture will show that the Holy Days of the Lord Jesus Christ were not done away with in scripture. There is an obligation and benefit that comes from observing them.
These holy days are listed in detail in Leviticus 23. However it's important to recognize that they were given to those who worship God BEFORE the establishment of the old covenant. Biblically there's a very strong case that they were established at the creation of the earth. For example:
Gen 1:14 Then God said, "Let there be lights in the firmament of the heavens to divide the day from the night; and let them be for signs and seasons, and for days and years
The term translated "seasons" is actually the same hebrew word that is used for the holy days of the Lord. Some translations render the verse:
(GW) Then God said, "Let there be lights in the sky to separate the day from the night. They will be signs and will mark religious festivals, days, and years.
The notion that Galatian 4:10 "did away" with these flies in the face of future prophecies of people keeping these feasts of Christ as well as the early church's observance of them in the books of the new testament. In addition there are specific greek words used to denote Gods' feast in new testament scripture and these words are not used in Galatians 4:10.
The real story of why Christianity doesn't observe them is simple: Traditional Christianity "evolved" away from them mainly due to Antisemitism. The people in Judea revolted against the Roman empire in a series of revolts in the early first and 2nd centuries. (Jewish-Roman Wars
As a result anything that "looked" Jewish was spat upon, criticized and discouraged by Rome, the most powerful military power on the planet. This hatred of anything that looked jewish was incorporated throughout culture and society and still explains the antisemitism we have today.
In other words, and this is hard for most to hear, the traditional church today was founded by those who abandoned the ways of God when it comes to worship because they couldn't stand the heat. The day of worship was changed from the sabbath to Sunday. Scriptures were cherry picked and mistranslated to support this change and is still done today to justify abandoning the holy days (and other things) of Christ.
I disagree, as they are still contrary to the basis for true worship under the New Cov,, which was the issue behind the censure of Gal. 4:10, and which is not the lunar calendar as under the Law or whatever worldly means pagans based it on, but the basis is being led by the Spirit, whom the Galatians had. (Gal. 4:6)
But if you want to honor the Lord by observing them as part of Christian liberty, it should not be a big issue, but if you contend that is ordained obedience then i totally reject it as such.
The notion that Galatian 4:10 "did away" with these flies in the face of future prophecies of people keeping these feasts of Christ as well as the early church's observance of them in the books of the new testament
By that rational you would have to support a distinctive sacredotal priesthood, and temple sacrifices for today as they also are what future prophecies tell of for God's people, but which refers to the dispensation of the millennial kingdom.
And nowhere, despite assertions otherwise, is the NT church shown specifically observing the 7th day. The souls in Acts 14:44ff were not part of a NT church, nor were those in Acts 21. Instead,
On the first day of the week (usually considered the day of Firstfruits), after Jesus has been raised from the dead (Mk. 16:9), he appears to Mary Magdalene, Peter, Cleopas, and others. "On the evening of that first day of the week" (Roman time), or the evening beginning the second day (Hebrew time), the resurrected Jesus appears at a meeting of ten apostles and other disciples (Jn. 20:19). The same time of the week "a week later" (NIV) or, more literally, "after eight days again" inclusive (KJV), Jesus appears to the eleven apostles and others (Jn. 20:26). After Jesus ascends (Ac. 1:9), on the feast of Pentecost or Shavuot (the 50th day from Firstfruits and thus usually calculated as the first day of the week), the Spirit of God is given to the disciples, who baptize 3,000 people into the apostolic fellowship. Later, on one occasion in Troas, the early Christians meet on the first day (Hebrew) to break bread and to listen to Christian preaching (Ac. 20:7). Paul also states that the churches of Corinth and Galatia should set aside donations on the first day for collection (1 Cor. 16:2). -https://en.wikipedia.org/wiki/Sabbath_in_Christianity#Biblical_tradition
In addition there are specific greek words used to denote Gods' feast in new testament scripture and these words are not used in Galatians 4:10.
That also is not a valid argument. A rose by any other name. "You drive cars" does not have to name them. The issue is not which feasts they were observing, but that they were bound to ritually observe a liturgical calendar determined by "the elements of [belonging to] the world," (Gn. 4:3) not led by the Spirit.
In other words, and this is hard for most to hear, the traditional church today was founded by those who abandoned the ways of God when it comes to worship because they couldn't stand the heat. The day of worship was changed from the sabbath to Sunday
That is ignoring the manifest distinctions btwn " Not according to the covenant that I made with their fathers in the day when I took them by the hand to lead them out of the land of Egypt," (Heb. 8:9) and the New Cov. in which the ceremonial laws are abrogated, that of "meats and drinks, and divers washings, and carnal ordinances, imposed on them until the time of reformation," (Hebrews 9:10) "or in respect of an holyday, or of the new moon, or of the sabbath," (Col 2:16), while upholding the moral law in looking to Christ as the standard. Thus all 9 of the 10 commandments are reiterated in the NT with the conspicuous exception of the command to keep holy the Sabbath. Nor is failure to keep the Sabbath day condemned as sin.
Likewise there is no mention of the NT church as a NT church worshiping on the 7th day, but the only specific day mentioned is the 1st day.
Paul met on the Sabbath, and did other things in seeking to become all things to all, but never taught the church sabbath-keeping, and in fact his only mentions or the sabbath or one day being above all are in regards to its observance as being part of Christian liberty. (Col. 2:16; Rm. 14:6) Christians are not commanded to keep the 1st day either, but we do have solid precedent for so doing.
And if we must keep the 7th day, it must be kept from sunset to sunset (Lev. 23:32) and with no burden being to be carried (Jer. 17:21), and no fire kindled (Ex. 35:3).
The real story of why Christianity doesn't observe them is simple: Traditional Christianity "evolved" away from them mainly due to Antisemitism.
That is false because it is actually the NT church that provides no example of it keeping the 7th day, or command to do so, or censure for not doing so. And besides Scripture, historical testimony is provided which teaches the early church met on the 1st day.
But this can go on extensively, as it has already here in the past, and i am not going use more energy doing so again.