True! We are all sinners! That is why God gave us a chance to prove ourselves capable of dying holy to become eligible for grace
We are all sinners is a myth against salvation by grace for those who overcame the falsehood in the myth, even unto death, to not disagree with God in anything.
Jesus died to pay the de facto sin of the repented believer in Him which irrevocably calls for our blood. The Evangel of grace exists because men can pass form 'sinner' to 'holiness' in an instant just by repenting to no longer sin , confession of the sins, and baptism.
Matthew 7:21 ASV
(21) Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father who is in heaven.
Matthew 16:24 ASV (24) Then said Jesus unto his disciples, If any man would come after me, let him deny himself, and take up his cross, and follow me.
1 Peter 1:13-16 ASV (13) Wherefore girding up the loins of your mind, be sober and set your hope perfectly on the grace that is to be brought unto you at the revelation of Jesus Christ; (14) as children of obedience, not fashioning yourselves according to your former lusts in the time of your ignorance: (15) but like as he who called you is holy, be ye yourselves also holy in all manner of living; (16) because it is written, Ye shall be holy; for I am holy.