Guess you need more of the passage first:
Rom 4:19-25 And being not weak in faith, he considered not his own body now dead, when he was about an hundred years old, neither yet the deadness of Sara's womb: He staggered not at the promise of God through unbelief; but was strong in faith, giving glory to God; And being fully persuaded that, what he had promised, he was able also to perform.
And therefore it was imputed to him for righteousness. Now it was not written for his sake alone, that it was imputed to him; But for us also, to whom it shall be imputed, if we believe on him that raised up Jesus our Lord from the dead; Who was delivered for our offences, and was raised again for our justification.
Earier context around this passage is also about faith..
(Rom 4:7-9) Saying, Blessed are they whose iniquities are forgiven, and whose sins are covered.Blessed is the man to whom the Lord will not impute sin. Cometh this blessedness then upon the circumcision only, or upon the uncircumcision also? for we say that faith was reckoned to Abraham for righteousness.
and :
Rom 4:11 And he received the sign of circumcision, a seal of the righteousness of the faith which he had yet being uncircumcised: that he might be the father of all them that believe, though they be not circumcised; that righteousness might be imputed unto them also:
So this passage is about righteousness imputed by Christ without the ordinances of the law. But through faith.
And Jesus-- died for our sins. And He started the local church system of service.. that runs by faith and not the dead OT Law.