Why do millions worship on Sunday instead of the Sabbath?
Elohim separated light from darkness on the First-Day (Genesis 1:3-5); the Holy Spirit raised Jesus from the dead on the First-Day (Romans 8:11-13); the Holy Spirit initiated the New Covenant Church at Pentecost on the First-Day; those who sought the Gospel initially met in the synagogues where the Apostles discussed the Gospel on the Sabbath (Acts 15:21; Acts 17:2) as this is where the Jews were gathered and the Gospel was given to them first though they rejected it (Acts 13:46), but when “Christian” believers began to gather together to honor our Lord Jesus, share the Scriptures, share our Lord’s supper, gather collections for the poor, they met on the First-Day (1 Corinthians 16:2; Acts 20:7,11,13) as the New Covenant was to be totally NEW and set apart from the OLD as new wine in new wine skins (Mark 2:22).
The Sabbath edict was given solely to Jacob’s children via Moses beginning in Exodus 16 and the Sabbath was to be a sign between God and Israel, alone (Ezekiel 20:12; Exodus 31:13). Never was a Gentile given the Sabbath other than those seeking inclusion into Israel’s society and thereby placing themself under the Law of the Covenant. In the New Covenant, Jesus is the fulfillment of what the Sabbath edict foreshadowed (Colossians 2:16); that is, a spiritual rest from striving after righteousness via works of the Law that only defined sin but provided no atonement (Romans 3:20; 7:6)…Jesus is my Sabbath rest in the New Covenant (Hebrews 4) and those who take refuge in Jesus as Lord by faith are not obligated to days, festivals, sabbaths, but Jesus is the fulfillment of these ceremonial edicts and Jesus is our God, Savior, Mediator, Creator, Peace.
In Jesus, I am free to worship, rest, honor my Lord, on any day or every day I choose in accordance with the Holy Spirit’s guidance and this includes Sunday and/or Saturday (Romans 14).