Cecelia Mary:
Hello. A co-worker (a 7th day Adventist) told me that keeping the Sabbath is more biblical than worshipping on Sunday. He also said that changing to Sunday was done by Constantine to have it “merge” (maybe not the correct word) with the pagan’s day of worship for the sun god. AND (here’s the part I need help with most) that Early Church Fathers made Sunday the official day of worship as a sign of the Church’s authority here on earth.
*Some religious organizations (Seventh-Day Adventists, Seventh-Day Baptists, and certain others) claim that Christians must not worship on Sunday but on Saturday, the Jewish Sabbath. They claim that, at some unnamed time after the apostolic age, the Church “changed” the day of worship from Saturday to Sunday.
However, passages of Scripture such as Acts 20:7, 1 Corinthians 16:2, Colossians 2:16-17, and Revelation 1:10 indicate that, even during New Testament times, the Sabbath is no longer binding and that Christians are to worship on the Lord’s day, Sunday, instead.
The early Church Fathers compared the observance of the Sabbath to the observance of the rite of circumcision, and from that they demonstrated that if the apostles abolished circumcision (Gal. 5:1-6), so also the observance of the Sabbath must have been abolished. The following quotations show that the first Christians understood this principle and gathered for worship on Sunday. *
much more information here:
catholic.com/library/noncatholic_groups.asp