As I pointed out earlier on the thread, the Sunday worship was unique to Rome and Alexandria as late as the 5th Century.
Sunday worship is a Roman Catholic tradition, it is NOT a Christian Tradition.
How many other Roman Catholic traditions are you clinging to?
Dr. E, since you are so adamantly opposed to all extra biblical Roman Catholic traditions, why do you cling to this one?
The only people who think the fifth century church was Roman Catholic are Roman Catholics. The fifth century Christian church was the fifth century Christian church.
Historically the fathers of the Christian church decided that the hope of the resurecction is better celebrated on the first day of the week, as the sunrise of a new day, rather than the last day of the week, like the sunset of the old day.