The doctrine of the inevitability of sin in Christians is the cause of my deepest laments. It's clear to me that the church, almost universally, has abandoned God's plan for believers regarding obedience.
Every day I hear or read something about how the sinful nature is in us all, that we, as Christians, will always suffer this indwelling presence, when, in fact, there is no Scripture that says anything like that. There is no evidence for the existence of a sinful nature at all.
Readers of the NIV translation might wonder why I say that, as they read those words time again in their translations, but the NIV translates sarx (flesh) inaccurately, so they are being misled.
This flesh is simply our bodies, so the New Testament writers created a term for the control our natural desires had on us as unbelievers. There is no sinful essence within us, no anti-God spirit that sneaks into our minds at birth that causes us to stray from God. This has become a sad, "the devil made me do it" excuse for sinful behavior.
The flesh, the bodily desires' control, is crucified and removed when we become Christians (Romans 6:6, Galatians 5:24, Colossians 2:11), so even that concept is no longer effectual in a believer. There is absolutely nothing that can make us sin. Yet, most preachers teach as if sin is something that we can never escape in this life, even as believers. This is the most evil lie that has ever been spoken in church, yet it is also the most common and widely believed.
Jesus put the matter plainly, and the power and completeness of His words are almost always ignored.
"Truly, truly I say to you, everyone who commits sin is the slave of sin ... If, therefore, the Son shall make you free, you shall be free indeed. (John 8:34, 36)
No Christian is a slave of sin, because we are free, yet anyone who sins is a slave of sin. The sinful nature doesn't exist, and all the passions and desires of the flesh are crucified (Galatians 5:24).
I see no shadows in the words of Christ. If we who profess Christ continue in sin, we prove that our profession is invalid. And those who profess Christ and continue in sin are dishonoring His name.