Those who believe that we are conditioned to sin, that it is learned behavior, must willfully ignore some black-letter Scripture. The Fall from God’s grace is what we might now call the backstory.
The deal is sealed by God when He says, in Genesis 8:21, that
the intention of man’s heart is evil from his youth.
Those who think men may be perfect are confused. The best we can do on this side of the Cross is attempt to shed ourselves of sin. Some fail utterly, some come quite close. No one is completely successful.
Those that make such claims have the sin of pride.