Clearing things up. Jesus first ministered to Jews. He did not take Mosaic Law away from them because it would be apostasy to discourage them from keeping it. He let them decide on their own to fix attention on his new teachings. Baptism helped with that. Peter and some others did make a shift, while James of Jerusalem focussed on both Jesus and Law. It was a personal choice. No apostasy involved. Then came the result of the resurrection of Jesus. The teaching of Jesus the only conqueror of death, Lord over Gentiles as well as Jews, became very relevant to Gentiles. Jesus is light of the whole world and his resurrection fully realised this. So he sent Paul to the Gentiles. He gave Paul a new aspect of the gospel message especially relevant to Gentiles, which us that they do not have to keep the Mosaic Law. No need for circumcision once they are baptised into Jesus. In fact, Gentile disciples being circumcised after baptism amounts to a different kind of apostasy: Apostasy away from the faith and grace of Jesus. Paul even pronounced in his epistle to Gentiles a heavenly curse on anyone preaching to the Gentiles a different gospel. This gospel from Jesus is paramount.
