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If you think we have no need of repentance to Christ Jesus of slip-ups after having believed on Him and baptized in Him, then you go directly against the Scriptures. Obviously, I am not a believer in the "Once saved, always saved" doctrine of men.
You would be in error. and following the same way as the pharisees.
And if you really believe that Rom.3:25 is only about forgiveness of sin for those up to the time of His death and resurrection, then that would mean all born after that have no remission of sins, i.e., like us today.
Rom 3: 25 says he in his forbearance passed over the sins of the past. Speaking of OT saints. Any sin from that time forward would be sins of the future, not the past.