Law and Grace cannot be blended into one doctrine
COMMENT:
Peter and Paul had way more in common than differences. And your wispy doctrine has you all mixed up if you think you only have to follow what Paul says and not the apostle Peter. They are both apostles of this age of the new covenant and both their writings are to be obeyed because they are both divinely inspired.
ANSWER:
Jesus said the following to his disciples,
Mat 10:5-6 These twelve Jesus sent forth, and commanded them, saying, Go not into the way of the Gentiles, and into any city of the Samaritans enter ye not: (6) But go rather to the lost sheep of the house of Israel.
Furthermore, Jesus himself mentioned about his ministry,
Mat 15:24 But he answered and said, I am not sent but unto the lost sheep of the house of Israel.