You are really convinced that Jews are gentiles; aren't you.
Sure you ain't some kinda weird MORMON?
Israel was divided when Solomon died, into the House of Judah, the southern kingdom, and the House of Israel, the northern kingdom. The north was out of covenant from the word go. they feared domination by Judah, so they set up a false worship without "going up" to Jerusalem for the feasts.
To whom he was sent:
Matthew 10:
[5] 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.
Matthew 15:
[24] But he answered and said, I am not sent but unto the lost sheep of the house of Israel