Paul for Everyone: Galatians and Thessalonians

Who then are we? We are the Messiah’s people, with his life now at work in us. And, since the central thing about him is his loving faithfulness, the central thing about us, the only thing in fact that defines us, is our own loving faithfulness, the glad response of faith to the God who has sent his son to die for us. This is the very heart of Christian identity.

ho are the true people of God? Is it all who belong to the Messiah? Or is it only Jewish Christians (including proselytes, i.e., Gentiles who have converted to Judaism), with Gentile Christians remaining second-class citizens?