Seeing Moses is Read in Every Place

The Apostles and Elders at Jerusalem decreed that churches among the Gentiles need not and should not become places which basically required Gentiles to become Proselytes to Judaism. Rather, the churches were to be places where everyone could belong, regardless of ethnicity, and eat together at the same table, without any one particular ethnic group's peculiar cultural practices being allowed to bar others. Specifically, churches didn't need to become especially Jewish in identity and practice, seeing any Jewish members of the churches could readily avail themselves of all things Jewish by attending their local synagogues which were everywhere. So the Jewish culture didn't need to be imposed on Gentiles and insisted on in the churches. But there was something to be said to Gentiles too, in order to keep the peace and unity in the churches across the potential divide of cultural backgrounds. And the Apostles and Elders listed those. 
Obviously those few things weren't the only things which believers in Jesus were to avoid. Of course there were others. There were new moral standards for believers to express, but those were not so much a matter of adopting cultural markers. The issue in the Apostles and Elders' statement wasn't just about what is the comprehensive list of moral rights and wrongs and where to find it. It was largely about cultural identity. It was a question of, Did Gentiles need to become Jews. And their answer was, No. But churches were taught about morals, beyond just the cultural markers listed. Like not stealing, for example. But churches weren't to teach that Gentiles needed to become Jewish. That's altogether a different issue and question - and answer. 

Any Jewish members of the churches could readily satisfy their cultural needs at their local synagogues. Neither becoming Jewish, nor offending Jews - nor offending Gentiles - wasn't what church needed to be about. Church was to be for everyone.