There was only one day in history when sins were paid for. When you believed you were merely informed about what happened that day, and the results were imputed to you.
We Are justified freely by the same faith
Romans 3: 21 But now the righteousness of God apart from the law is revealed, being witnessed by the Law and the Prophets, 22 even the righteousness of God, through faith in Jesus Christ, to all [f]and on all who believe. For there is no difference; 23 for all have sinned and fall short of the glory of God, 24 being justified [g]freely by His grace through the redemption that is in Christ Jesus, 25 whom God set forth as a [h]propitiation by His blood, through faith, to demonstrate His righteousness, because in His forbearance God had passed over the sins that were previously committed, 26 to demonstrate at the present time His righteousness, that He might be just and the justifier of the one who has faith in Jesus.
Rom 5: 1 Therefore, having been justified by faith, we have peace with God through our Lord Jesus Christ
Gal 2: 16 knowing that a man is not justified by the works of the law but by faith in Jesus Christ, even we have believed in Christ Jesus, that we might be justified by faith in Christ and not by the works of the law; for by the works of the law no flesh shall be justified.
Gal 3: 24 - Therefore the law was our tutor to bring us to Christ, that we might be justified by faith