Through the Gospel of Matthew, Craig and Troy continue talking about the "two religions." One is firm, built on the rock of Christ. The other is unstable, built upon literally anything else.
Pastor Paul is perplexed over the presumptiveness of people of a pugnacious persuasion who consider themselves to be in a position to pass over the Gospel.
So, look . . . if you want to rely upon works of the Law to lay claim to the title "child of God," you can't. To be under the Law is to be a slave, and slaves are not sons.
Paul shows that the Law was never intended to save, but that salvation comes only through promise. The Law merely served as an instructor until the coming of the promised Christ.
Paul has a full head of steam and runs into the ground the notion that we receive the Spirit by works instead of by grace. Instead, we are of Abraham, the man of Christ.