I totally disagree with you here. There is plenty of Biblical evidence to demonstrate that early New Testament Christianity assembled for worship on the first day of the week (Acts 2:1; 20:7; 1 Cor. 16:1-2; Rev. 1:7). There is sufficient testimony from within the FIRST century all the way to the fourth century that this was the universal custom based upon the universal belief that Christ rose on the first day of the week. There is suffient evidence in John 20 that Jesus Himself habitually met with the disciples on the first day of the week.
There are scriptures that clearly teach a change from the Old Testament Sabbath day to a new and better day (Psa. 118:20-24 with Acts 4:10-11; Mark 16:9; Heb. 4:9-10 and especially the understanding and usage of "kuriakos" in Rev. 1:7).
The New Covenant provided a NEW house of Worship - the church
The New Covenant provided NEW ordinances - baptism and the Lord's Supper
The New Covenant provided a NEW day of worship - first day of the week
The New Covenant provided NEW officers - apostles, Pastors, deacons
Resorting back to the OLD covenant and THE SIGN of the OLD Covenant (the seventh day Sabbath) is to reject the New Covenant and that is the message of Hebrews and Galatians.
Paul explicitly states that the Old Covenant Sabbatical system has been done away with - Col. 2:16.
Sorry, but those are just "proof-texts", and do not exegete themselves into the developed "system" that you and traditional scholarship indicate.
Acts 2:1 mentions Pentecosts, which was one of the Jewish festivals. People argue about it being on Sunday, but that is not verified. It actually depends on the reckoning of which sabbath (weekly or annual) the count to Pentecost from the wave sheaf offering day begins. The Sadducees favored sunday, after the weekly sabbath, while the Pharisees favored different days, following the annual sabbath (the first day of unleavened bread). the Sadducees may have had some authority at the time, but Jesus says the Pharisees were the ones who had the practices right. The Sadducees, as we can see in other areas, were heterodox.
And on that, the Ps.118 argument would fall. (And acts 4, which you tacked onto it, also does not interpret that as a "new weekly worship day".
20:7 mentions the day of the week
in passing. It does not say it was a "sunday worship service replacing the weekly sabbath".
1 Cor. is also a passing reference, and does not mention any new "day of
worship".
Rev. 1:7 also does not mention any new weekly day of worship, and many believe it might simply be another reference to "the Day of the Lord", which is the only "day" said to be "possessed"by the Lord like that (other than the sabbath in the Old Testament).
Just look at the context. Why would the day he was having the prophecy on matter? (Unless you're some sort of old time charismatic who believes a person can only be "in the spirit" "in the Lord's House on the Lord's Day" or something).
There is also the same ambiguity with other early references interpreted as a "day", such as Ignatius, and the Didache. I believe Justin is the first to clearly indicate a specific day.
Mark's resurrection account also doesn't say anything about a new day being made from it.
John 20:26 "after eight days", is also taken to prove the disciples were now "observing" a "regular weekly Sunday worship". C
ONTEXT! Why would they be "celebrating" the resurrection when they were only just discovering it, and some were still slow to believe in it?
Heb.4 does argue against the literal sabbath by showing the "rest" is spiritual. It does not push for a different day, which would misunderstand it just as much as the sabbatarian insistence it is a literal day. (And it doesn't say that Jesus assembled them there to start a new day of worship, either).
When you see weekly references like this, remember, they were still Jews; they were not throwing off everything Jewish instantly like that, so their week was still framed around the Sabbath. So when the sabbath is over, it is the first day of the week, and
that is when regular activities in their lives resume. T
HAT is why it gets mentioned the way it does. Nowhere is it ever said to be a replacement of the sabbath. It was the later church that interpreted it that way.
Along with the emerging interpretations of the ordinances, officers, the institution of the Church, etc. which most of us reject.
You're probably seen some of the old debates with Bob Ryan, and the sabbathkeepers are able to find
the same sort of "proofs"-by-implication for the sabbath in the same books (Acts, etc) and more.
If the sabbath was still mandatory, then NT scriptures would come out and clearly say it, and if the day was switched to Sunday, then the NT scriptures would come out and clearly say it.
The new house of worship, ordinances and officers are clearly, directly mentioned in the NT.
No need for this "piece together the puzzle" approach. All this proves, is what Col. 2:16 really says. (How could you even take that as a proof of mandatory Sunday, when that is one of the prime verses used against mandatory Sabbath? They both stand or fall together, there!)