Never heard of Canceling the Sabbath
Never heard any denomination or any church say God made a mistake
Never heard any church teach that the OT scripture can be in error
I have heard of some churches teaching to observe Jewish feasts, but I am not familiar with their doctrine.
I have heard of some churches observing Passover like Jews but I am not sure why.
Never heard of any church that teaches that we are under the Law of Moses after what Paul wrote in Romans and Galatians
My views on sabbath according to the scriptures I have read and understood so far:
The Christians met on the first day of the week but there is no reason to suggest that they were attempting to establish it as a replacement for the Jewish sabbath. This was taught later and became traditional folk lore but I do not believe it was the intention of the first church.
I am not persuaded that "The Lords Day" in Revelation means Sunday. I think John was saying that he was translated by the Spirit into the Day of the Lord (Lord's Day) Greek works both ways (I am not an expert in Greek, I read about this from Joseph A Seiss Apocalypse: Lectures on Revelation) Later people misinterpreted to say that John was calling Sunday the Lords Day and then we find that usage "The Lords Day" referring to Sunday beyond the 1st century. (Fact checks are welcome)
The sabbath was still be observed by Jews and any Jew could continue to do so however It was made very clear at the first council at Jerusalem in the book of Acts 15 that the gentiles were not expected to keep these Jewish traditions.
1And certain men which came down from Judaea taught the brethren,
and said, Except ye be circumcised after the manner of Moses, ye cannot be saved.
2When therefore Paul and Barnabas had no small dissension and disputation with them, they determined that Paul and Barnabas, and certain other of them, should go up to Jerusalem unto the apostles and elders about this question. ...
4And when they were come to Jerusalem, they were received of the church, and
of the apostles and elders, and they declared all things that God had done with them.
5But there rose up certain of the sect of the Pharisees which believed, saying, That it was needful to circumcise them, and to
command them to keep the law of Moses.
6And the apostles and elders came together for to consider of this matter.
7And when there had been much disputing, ...
10Now therefore why tempt ye God, to put a yoke upon the neck of the disciples, which neither our fathers nor we were able to bear? 11But we believe that through the grace of the Lord Jesus Christ we shall be saved, even as they.
...And after they had held their peace, James answered, saying, Men
and brethren, hearken unto me: ...
19Wherefore my sentence is, that we trouble not them, which from among the Gentiles are turned to God:
20But that we write unto them, that they abstain from pollutions of idols, and
from fornication, and
from things strangled, and
from blood.
21For Moses of old time hath in every city them that preach him, being read in the synagogues every sabbath day.
The Letter to the Gentile Believers
22Then pleased it the apostles and elders, with the whole church, ...
23And they wrote
letters by them after this manner; The apostles and elders and brethren
send greeting unto the brethren which are of the Gentiles in Antioch and Syria and Cilicia:
24Forasmuch as we have heard, that certain which went out from us have troubled you with words, subverting your souls, saying,
Ye must be circumcised,
and keep the law: to whom we gave no such commandment: 25It seemed good unto us, being assembled with one accord, to send chosen men unto you with our beloved Barnabas and Paul,
26Men that have hazarded their lives for the name of our Lord Jesus Christ.
27We have sent therefore Judas and Silas, who shall also tell
you the same things by mouth.
28For it seemed good to the Holy Ghost, and to us, to lay upon you no greater burden than these necessary things; 29That ye abstain from meats offered to idols, and from blood, and from things strangled, and from fornication: from which if ye keep yourselves, ye shall do well. Fare ye well.
The Believers at Antioch Rejoice
30So when they were dismissed, they came to Antioch: and when they had gathered the multitude together, they delivered the epistle:
31Which when they had read, they rejoiced for the consolation. 32And Judas and Silas, being prophets also themselves, exhorted the brethren with many words, and confirmed
them.
Now you notice that he mentioned that the Law of Moses is read every day on the Sabbath in the synagogue and contrasted it with what the Christians were about. So observing sabbath at that time would require observing the Law of Moses which is being contrasted with something different for the gentiles in this council meeting. They were not being asked to observe the sabbath just like they were not being asked to observe circumcision.
21For Moses of old time hath in every city them that preach him, being read in the synagogues every sabbath day. Also, notice the consolation and rejoicing of the gentile when they read that letter telling them they did not need to observe the Law of Moses. Which when they had read, they rejoiced for the consolation.
So take a big sigh of relief and just begin to worship the Lord Jesus Christ right now and say THANK YOU JESUS that I do not have to observe these Jewish customs to be justified. Thank you that I am saved through the grace of the Lord Jesus Christ!
1
I don't think you want correcting 
