IN EVERY SINGLE instance of the term "Sabbath" used as a reference to a weekly day of worship in the NT - it is the 7th day of the week.
This point is one you probably don’t want to make since it rather neatly invalidates the claim made by other Adventists that St. Paul, in instructing us not to let others judge us on the observance of Sabbaths, festivals etc in Colossians 2:16, was referring to Sabbaths other than to the seventh day of the Jewish week.
But whether read one way or the other, the problem is that the New Testament does not support the strict following of the Sabbath required by some denominations such as the SDA, Seventh Day Baptists et cetera.
Indeed, the Eastern Orthodox, Oriental Orthodox, Assyrian Church of the East, Ancient Church of the East, and the Roman Catholic Church, and the Anglicans and Lutherans observe the Sabbath not only by having worshipping services on this day throughout the year, particularly in the Orthodox churches and the Assyrian church, but also, by virtue of our observance of the Great Sabbath, that being the day on which God rested following having remade humanity in His image on the Cross, just as He had rested following His creation in Genesis 1, the primary text that supports our practice of regarding the Sabbath as a restful day of worship for our benefit, but one which the Christian is free to use, following the examples of Christ our True God, in a manner that differs from the strict rules of Judaism, and furthermore, which in no respects precludes worshipping on other days, chiefly on the Lord’s Day, in memory of His glorious resurrection, which becomes more important, both devotionally and eschatologically, for the universe began on this day, and the life of the World to Come is also represented on this day, for it was on this day that Christ our True God rose from the dead.
Thus, on the sixth day, we are made in the image of God, on the Cross, on the seventh day, God rests and we commemorate His victory, and on the first and eighth day, we celebrate the Light, of the Resurrection, of Christ the Son and Word of God risen in the East like the Sun, and the Light of the Life of the World to Come, the Uncreated Light of Tabor, the day that the Lord hath made, for us to rejoice and be glad in, for He has conquered death, now and ever and unto the ages of all ages.
It is the day for the Eucharist, in which we partake of the very body and blood of Christ our True God, as believed in by traditional Anglo Catholics such as my friend
@Jipsah , by traditional Lutherans such as my friends
@MarkRohfrietsch and
@Ain't Zwinglian and by my Catholic friends
@chevyontheriver and
@Xeno.of.athens and by my fellow Orthodox friends
@prodromos and
@jas3 to name just a few, as well as by other traditional liturgical Christians, who on this issue as well as on the Sabbath are promoting correct liturgical and devotional worship practices which are fully consistent with all commandments, with the Nicene Creed, and with the Holy Tradition we are required by St. Paul in 1 Corinthians 11:2 and 2 Thessalonians 2:15 to adhere to, which provides us with the Creed and the New Testament itself, and the documents of which concerning the history of the early church are extremely reliable compared to alternative histories presented by some people who disagree with Roman Catholicism apparently for the sake of disagreeing with it based on extreme anti-Roman Catholic reactionism.