Some religious groups such as Seventh-day Adventists, Seventh-Day Baptists and the Jews, worship on Saturdays. These churches are strictly following the Jewish Sabbath.
Most Christian churches worship on Sundays or the "Lord's Day." If Saturday is the Sabbath day, then why do Christians worship on Sundays?
According to some passages in the Bible, Saturday is no longer considered as the day of worship. It is because of the new covenant that Jesus had made.
"And upon the first day of the week, when the disciples came together to break bread, Paul preached unto them, ready to depart on the morrow; and continued his speech until midnight (Acts 20:7)."
According to the Gregorian calendar, also known as the Christian calendar, the first day of the week is Sunday. Therefore, Sunday was the day when the disciples gathered together.
The early founders of the Christian church associated the observance of Sabbath to the rite of circumcision. If this passage would be considered, the rite of circumcision was abolished by Jesus, along with the old Sabbath.
"For in Jesus Christ neither circumcision availeth anything, nor uncircumcision; but faith which worketh by love (Galatians 5:6)."
Early Christian writings also support that Christians should worship on Sundays.
"On the Lord's Day of the Lord come together, break bread and hold Eucharist, after confessing your transgressions that your offering may be pure (Didache 14:1).
"Wherefore also we observe the eighth day as a time of rejoicing, for on it Jesus both arose from the dead and, when he had appeared, ascended into the heavens (Epistles of Barnabas 15:9)."
These are just a few examples of the early Christian writings that support the reason of the present church in designating Sunday as the day of worship.
Another reason for not following the Jewish Sabbath day is that Christians are no longer bound by the old laws. Christians are following the pattern that Jesus had started, which was to worship God through faith, love and good deeds.