According to the teachings on justification by faith, who was the one man whose obedience brought righteousness to the world?

According to Peter, a Christian should exercise his freedom by

Those who are not qualified for a place in the Kingdom of God include:

According to Paul in Galatians, Christians have become children of God through

I will faithfully give them their recompense, and I will make an everlasting covenant with them.

The above statement of the LORD to Israel in Isiah's prophecy suggests