James clearly stated in Acts 15:21 that Moses' writings were read to Gentiles and Jews on the Sabbath.
Even if you are correct about Acts 15:21. How does that prove that the gentiles were bound to keep,the Sabbath?
Acts 15:21,
For Moses has had throughout many generations those who preach him in every city, being read in the synagogues every Sabbath.
Where does this passage even mention gentiles being included in hearing Moses preached
In the synagogue?
Do you not know, that gentiles were not even allowed in a synagogue?
You had to be circumcised to enter the synagogue!
Let's see what is really going on with the gentiles in Acts 15.
Acts 15:5
But some of the sect of the Pharisees who believed rose up, saying It is necessary to circumcise them(gentile christians) and to
command them to keep the law of Moses.
-6 Now the apostles and the elders came together to discuss this matter.
-9 and made no distinction between us and them, purifying their hearts by faith.
-10 Now therefore, why do you test God by putting a yoke around their neck of the disciples which neither our fathers nor we were able to bear?
-19 therefore I judge that
we should not trouble those from among the Gentiles who are turning to God.
-20 but that we write to them to abstain from things polluted by idols, from sexual immorality, from things strangled and from blood.
Now listen very closely to what the apostles decide to tell the gentile Christians,
-24 Since we have heard that some who have went out from us have troubled you with words.
Unsettling your souls, saying You must be circumcised
and keep the law--to whom we gave no such commandment.
Conclusion:
Acts chapter 15 teaches the opposite of gentiles keeping the old law.
In reality it is teaching the gentiles HAVE NEVER BEEN BOUND TO KEEP THE LAW OF MOSES.
And the apostles teach that no gentile Christian is to keep the law of Moses! They gave no such commandment!
There is no commandment in the new testament for gentiles or Jews who are christians to keep the Sabbath day.