Luke 4:16 was before Jesus died. Sunday became the day of worship after Jesus’ resurrection.
Acts 20:7
1 Corinthians 10:16-17,1 Corinthians 11:23-24
I wish to point out to you that none of the versus you cite say anything about Gentiles. I don’t believe you can show any verse that specifically mentions Gentiles worshiping on a Sabbath. Paul was trying to convert the Jews. The best place for that would be where they would meet. The largest gathering would be in the synagogues. In fact, scripture so states that Paul Acts 13 “they proclaimed the word of God in the synagogues of the Jews” It doesn’t say Paul’s synagogue but the synagogue of the Jews. That indicates to me that Paul was not worshiping but preaching.
You are right about Luke 4:16
I already commented on Acts20:7 - breaking of bread was a daily custom, You are suggesting that this meetings was a gathering of worship, would it be a custom to worship until midnight, Jesus did not specify what day the The Lord’s supper was to be observed, etc, etc.
1 Corinthians 10:16-17,1 Corinthians 11:23-24 - No mention at all that the observance of the Lord’s supper is to be done on the first day of the week.
**Sabbath worship in the NT **
Paul EVERY Sabbath…(Act 18:4) And he reasoned in the synagogue every sabbath, and persuaded the Jews and the Greeks.
The Sabbath commandment is for the “stranger” too. The fourth commandment itself says the “stranger” is to rest on the Sabbath. Exodus 20:10. “Strangers” are non-Jews, or Gentiles. Thus the Sabbath applies to them too. Read also Isaiah 56:6.
Isaiah said Gentiles should keep the Sabbath. “Also the sons of the stranger … every one that keeps the Sabbath … for mine house shall be called an house of prayer for all people.” Isaiah 56:6, 7. Thus the Sabbath is for Gentiles and “all people,” not just for Jews.
Gentiles kept the Sabbath in the Book of Acts. “The Gentiles besought that these words might be preached to them the next Sabbath … Paul and Barnabas … persuaded them to continue in the grace of God.”’ Acts 13:42, 43. Here saved-by-grace Gentiles kept the Sabbath (see also verse 44).
Luke was a Gentile who kept the Sabbath. Luke was the only Gentile who wrote any New Testament books (he wrote The Gospel According to St. Luke and The Acts of the Apostles). Luke traveled with Paul and wrote, “On the Sabbath we went out of the city by a river side.” Acts 16:13.
These verses provide ample evidence that both the Jews and the Gentiles worshiped on the Sabbath.
written with love