There are 7th day Baptists, the Church of God, several others. When the Pitcairn Islanders were discovered (yes, the mutiny on the Bounty survivors) they only had the bible to go by---they were clothed, not eating pork, and keeping the 7th day Sabbath. Long before any white man showed up in Alaska, there was Maniilaq, telling his people about the 7th day
Maniilaq, the Eskimo Prophet --there were some in South America and Africa.
The question can be put to rest very easily---all anyone has to do is name the verse that states---the Sabbath is now the 1 day of the week. Isn't there.
Every single verse that people use to defend the 1st day of the week has been shown to have nothing to do with keeping Sunday as a day of worship, even the Catholic church admits that, they changed it by their own supposed power, not by the bible.
“Question: Have you any other way of proving that the church has power to institute festivals of precept?
“Answer: Had she not such power, she could not a done that in which all modern religionists agree with her; -she could not have substituted the observance of Sunday the first day of the week, for the observance of Saturday the seventh day of the week, a change for which there is no Scriptural authority.” Stephen Keenan,
A Doctrinal Catechism On the Obedience Due to the Church, 3rd edition, Chapter 2, p. 174 (Imprimatur, John Cardinal McCloskey, Archbishop of New York).
It was written by Jesus Christ Himself, on stone (twice, Moses broke the 1st one) and kept in the Ark, the Levitical laws, written by the hand f Moses was written on scrolls, and kept outside the Ark.
It was not given to Jews but to man, it was made for man --at creation as a sign of the creative power of God, to deny the Sabbath is to deny Him as the creator of all.
Gen 2:2 And on the seventh day God ended his work which he had made; and he rested on the seventh day from all his work which he had made.
Gen 2:3 And God blessed the seventh day, and sanctified it: because that in it he had rested from all his work which God created and made.
What God has instituted, no man has the power to change. Jesus instituted it, He alone can change it and never did.
Catholic Church Changed Sabbath To Sunday Statements