Summer morning from the side deck.
To reinforce his claim to be preaching an orthodox Gospel, St Paul tells the Galatians that he went to Jerusalem and met with the recognized leaders: James, Peter, and John. They agreed that non-Jews did not have to become Jews to become followers of Christ. They sent Paul to areas that were predominantly Greek and Peter to areas that were predominantly Jewish.
Christianity is now the largest religion in the world. This would not have been the case if they had remained a reform movement within Judaism.