There are only two positions held in the time of Paul according to in Romans 14:5
“The Waldensians did not keep the Sabbath and were not guardians of the “Sabbath Truth” as you call it. The Waldensians . . . follow more: Romans 14,5-8.”
T . – Waldensian Minister in Italy (click to read the letter)
Romans 14:5 (NCV)
Some think that one day is more important than another, and OTHERS THINK THAT EVERY DAY IS THE SAME. Let all be sure in their own mind.
There are those who esteem one day above another. The Jews esteemed the 7th day above the other days of the week. And then there were those who ESTEEMED EVERY DAY ALIKE! New Testament Christians THINK THAT EVERY DAY IS THE SAME.
Notice that Paul did NOT say that some esteem one day above others, and then another group esteem A DIFFERENT DAY as better than the other groups day. No! The second group ESTEEMED EVERY DAY ALIKE!
Christians do not “observe” or “keep” Sunday. They assemble on Sunday!
Not forsaking THE ASSEMBLING OF OURSELVES TOGETHER, as the manner of some is; but exhorting one another: and so much the more, as ye see the day approaching.
John Gill’s Bible Commentary
Hebrews 10:25 Not forsaking the assembling of ourselves together,…. Or the episynagogue of one another; which word is used to distinguish Christian assemblies from Jewish synagogues, and to denote the coalition of Jews and Gentiles in one church state, and to express the saints’ gathering together to Christ; see 2Th_2:1 and their act of meeting together in some one place to attend his worship, word, and ordinances.
Adventist assert that Sunday is not commanded in New Testament, Guess what? The exact same argument holds true for the Sabbath. Because the Sabbath itself is not commanded anywhere in the New Testament!
Ellen White acknowledges that the validity of the Sabbath is “assumed” in the New Testament. She wrote against presumption, and yet her core teaching is based entirely upon presumptions about the Sabbath.
“The New Testament does not reenact the law of the tithe, as it does not that of the Sabbath; for THE VALIDITY OF BOTH IS ASSUMED.” R. & H., May 16, 1882 (emphasis supplied)
The New Testament does not give a single example of Christians conducting their religious services on the Sabbath.
However the Book of Acts gives several examples of Jews gathering into their synagogues on the Sabbath to read the Torah, and Paul raising havoc every where he went by preaching the Gospel to Jews, right in the middle of their own synagogues.