The Book of Acts talks a lot about this as it was an early point of debate in the early church. Many of the Jewish leaders in the church were arguing the gentiles should be burdened with Jewish customs as believers in Christ, but it was clear they decided this was not God's will and Gentiles were not to be burden with things like circumcision, keeping the 7 feasts, the High Holy days and other Jewish customs in the law. They were raised as pagan Gentiles who were coming to Christ, not Jews under the law.

And the understanding that spiritually we are all one in Christ, no matter if Gentiles or Jews. Jews who keep Jewish customs as believers in Christ or Gentiles who know little to nothing of those Jewish customs and practices.