If you want to kill Christianity you must abolish Sunday.

Voltaire

 Then, the same day at evening, being the first [day] of the week, when the doors were shut where the disciples were assembled, for fear of the Jews, Jesus came and stood in the midst, and said to them, “Peace [be] with you.” – Revelation 20:19, NKJV

 Now on the first [day] of the week, when the disciples came together to break bread, Paul, ready to depart the next day, spoke to them and continued his message until midnight. – Acts 20:7, NKJV

On the first [day] of the week let each one of you lay something aside, storing up as he may prosper, that there be no collections when I come. – I Corinthians 16:2, NKJV

I was in the Spirit on the Lord’s Day, and I heard behind me a loud voice, as of a trumpet, – Revelation 1:10, NKJV

One of my friends sent me a random text a few years ago. He said, “If the Sabbath is on Saturday are we disobeying God by going to church and worshipping him on a Sunday?” He didn’t have to say anything else, I knew he had someone from a cult in his apartment. This is one of the tricks they pull and most people don’t know how to answer. We just take it for granted that we worship on Sunday. 

The reason we worship on Sunday is because Jesus rose from the dead on a Sunday! The resurrection is a pretty big deal in Christianity! The early church began meeting on Sunday in effect moving the Sabbath from Saturday to Sunday. On the Sabbath day, God rested from his work of creation, and on Resurrection Sunday Jesus rested from his work of salvation. 

Apparently, the issue of worshipping on Saturday or Sunday and perhaps a question of celebrating other Jewish Sabbaths like the Passover came up in the early church. Some New Testament believers came from a gentile background and wondered if they were to keep the Sabbath day (at least as fully as their Jewish-Christian brothers and sisters).  Paul clarifies in his letters to the Romans and the Colossians that we are not to judge one another in the days we do or do not set aside for worship. 

 One person esteems [one] day above another; another esteems every day [alike]. Let each be fully convinced in his own mind. – Romans 14:5, NKJV

So let no one judge you in food or in drink, or regarding a festival or a new moon or sabbaths, which are a shadow of things to come, but the substance is of Christ. – Colossians 2:!6-17, NKJV

I don’t think that Paul is doing away with Sabbaths here in this passage. Since he uses the plural, “Sabbaths” in Colossians I think he is probably referring to Sabbaths outside the weekly Sabbath (other Jewish holidays). Either way, we know that Paul isn’t encouraging anyone to do away with the Sabbath day, only don’t let the difference in days of worship or celebration bother you about those who are otherwise biblically orthodox. 

Father, Your word is true and good. We are grateful that the days we worship and celebrate are not as important as the One we gather to worship and celebrate. We ask that you give purpose and meaning to all of our days. Let us be those who worship you in our Work and in our Rhythms of rest. In Jesus Name, Amen.