Are you a Seventh Day Sabbatarian?
Based on the Bible, I believe that God commanded the keeping of the Seventh Day Sabbath for His followers. In Genesis 2: 1 - 3 we find these words.
1 Thus the heavens and the earth, and all the host of them, were finished. 2 And on the seventh day God ended His work which He had done, and He rested on the seventh day from all His work which He had done. 3 Then God blessed the seventh day and sanctified it, because in it He rested from all His work which God had created and made.
There is no other day of the week that we can find in the entire Bible that was blessed by God and that was 'sanctified' (H6942). The Hebrew word for sanctified is qadash which is defined as: make, pronounce, or observe, consecrate, dedicate, hallow, be or keep holy. We find in God's Word that He further established this as the Fourth Commandment (Exodus 20: 8 - 11) of Ten Commandments that were given to the nation of Israel. The New Testament is about the New Covenant between God and all His followers (not just the nation of Israel or the Jews.) All OT laws were done away with except those Jesus Christ carried forward and made part of the New Covenant and that included the Ten Commandments. The Sabbath was never removed or replaced by any other day of the week and that includes Sunday. However, Jesus established a new set of directives in how the New Covenant Sabbath was to be kept that was radically different from how the Old Covenant was kept.
The sole source for beginning and establishing Sunday as the day of the week for worship is the Roman Catholic Church and its Pope. That religious organization and its leader, the Pope, never had and never will have any scriptural authority to change the day for weekly worship. Because of many ungodly and unscriptural beliefs and practices of the Roman Catholic Church as well as its authoritarian control and abuse of its members, I believe it is the world's largest Christian cult. No other 'Christian' Church has tortured and killed so many millions of individuals seeking to impose its will on them. It is a farce to even label them as a 'Christian' Church. A warning in Revelation 18: 4 - 5 tells Christians within that organization to come out before judgment takes place.
4 And I heard another voice from heaven saying, “Come out of her, my people, lest you share in her sins, and lest you receive of her plagues. 5 For her sins have reached to heaven, and God has remembered her iniquities.
Let me add this comment. I believe there are many many Christians who ignorantly worship on Sunday instead of on the Sabbath day. I further believe that God mercifully forbears to punish this transgression. Just as God forbears to punish many Seventh Day Sabbath keepers who ignorantly keep portions of the Sabbath on the wrong day following the wrong traditions of the Jews instead of the Word of God.