Your take is a popular one, taken by most Sunday-keeping Christians. There is nothing new here, but you should at least get your history right, you are honoring the day selected by the Roman Catholic Church. There is no scripture stating the Sabbath was changed to Sunday. Truth is never popular with most folks that like to rubber stamp even their beliefs on others. Wisdom must be sought outside the populist camp, through God’s Word.
Yep, this is all true. It is also irrelevant with respect to my Salvation.
You are using a Bible selected and preserved by the Roman Catholic Church. Three councils of bishops and a Papal decree between AD 380 and AD 410 promulgated the NT canon in the West. That's historical fact.
The claim that Christians held to a Saturday Sabbath for "centuries" is not, however. In fact, practically no Gentile Christians did. (And the Jewish Christians mostly apostatized into a heresy called Ebionism, which denied the divinity of Christ.) Ignatius of Antioch salutes his readers already in AD 107 for "no longer Sabbathing". Justin Martyr has already been quoted above.
Have you ever stopped to wonder why you keep the Ten Commandments, but not the other 603? Do you circumcise your baby boys? Avoid pork and shellfish? Avoid mixing fibers in your clothing? Of course not. Those are all commandments of the Jewish ceremonial law.
The Ten Commandments are a concise summary of the natural law, not the ceremonial law. Murder was wrong before Moses received the commandment at Sinai. So was idolatry. So was adultery. However, the commandment to worship on Saturday (distinct from the commandment to worship God and sanctify time through worship) is not part of the natural law; it's part of the Jewish ceremonial law of the Old Covenant.
It's not binding on Gentiles anymore than circumcision is.
By the way, doesn't the Bible say that women should keep silent in church and not teach men? How do you justify elevating the writings of Ellen Gould White to be practically equal to Scripture?