-what ever Christ did on the Cross didn't mean Paul would not sin
Paul never confessed a sin, in 13 epistles.
Why not?
Its for the same reason that he never told the young man, to "confess your sin"... who was fornicating with His Dad's new wife, in the Corinthian Epistle.
Read it.
See.... Paul is the NT teacher who taught the Church that "Christ is the End of the Law".. .which means the born again are "not under the Law , but under Grace"
God only sees the born again, as "under Grace"... never again, "under the law.".
That simply means, that : "where there is no LAW, there is no sin, no Transgression" defined or counted.
If you read 2 Corin 5:19 and John 3:17, and Romans 4:8... you'll discover that God does not charge sin to a born again Christian, ever again.
Not ever.
Why not?
Its because God has already judged Jesus TO DEATH, for all your sin... on The Cross., 2000 yr ago.
"God hath made JESUS.. to BE SIN.. .for us"... as "the one time ETERNAL Sacrifice for SIN".
Also..... Only the LAW can define sin as sin and you as a sinner..... and the Born again, are "not under the Law, but under Grace".
So, you have the Blood and Death of Jesus that has redeemed the born again from all sin, and there is no more LAW to define your behavior, as sin.. because "Christ is the END OF THE LAW, for Righteousness, to everyone who Believes" (All the born again).
The born again exist :
"IN Christ"
"One with God"
"seated in Heavenly Places..
A.) There is no sin found there, and all the born again, exist there.