That may have been true of the OT saints, but they needed a Savior , a sinless person does not need a Savior
Mat 18:11 For the Son of man is come to save that which was lost.
Luk 5:32 I came not to call the righteous, but sinners to repentance.
Rom 3:10 As it is written, There is none righteous, no, not one:
Rom 3:11 There is none that understandeth, there is none that seeketh after God.
Rom 3:12 They are all gone out of the way, they are together become unprofitable; there is none that doeth good, no, not one.
Here is the problem there is only one truth not many competing truths .
Either Mary was sinless or the scriptures lie .
And the answer is????
Scripture says that there is no other name by which men are to be saved except that of Christ Jesus.
Ergo, all sons and daughters of Adam, without exception, need a Savior.