In Reformed theology, one is declared (not “made”) righteous based on the alien imputed righteousness of Jesus. However, the verse immediately after one of their favourite “proof-texts” (Rom 4:1-8) disproves this theory. In Rom 4:9 we read (emphasis added):
Ο μακαρισμὸς οὖν οὗτος ἐπὶ τὴν περιτομὴν ἢ καὶ ἐπὶ τὴν ἀκροβυστίαν; λέγομεν γάρ· ἐλογίσθη τῷ Ἀβραὰμ ἡ πίστις εἰς δικαιοσύνην
Cometh this blessedness then upon the circumcision only, or upon the uncircumcision also? For we say that faith was reckoned to Abraham for righteousness.
The “blessedness” of Abraham (his “justification”) is not based on imputed righteousness, but Abraham’s faith. Indeed, based on the strict grammar of the Greek of this verse and Rom 4:5, 22 refute Reformed soteriology and its understanding of the “ground” of justification.