If you would pic up your bible you would understand that your statment is completely backwards. He doesn't exclude anyone that believes in him
John 1:11-13
He came into his own world, but his own nation did not welcome him. Yet some people accepted him and put their faith in him. So he gave them the right to be the children of God. They were not God's children by nature or because of any human desires. God himself was the one who made them his children.
Jesus was Jewish so by that very fact all those who are not part of the Jewish faith will not receive the grace of god.