I think there is an important difference that can get lost when Christians say, “We sin every day.”
Scripture does not teach that Christians are incapable of sinning after conversion. John says:
“If we claim to be without sin, we deceive ourselves and the truth is not in us.”- 1 John 1:8 NIV
John says immediately afterward:
“If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness.”- 1 John 1:9 NIV
Then he makes the purpose of his writing very clear:
“I write this to you so that you will not sin. But if anybody does sin, we have an advocate with the Father—Jesus Christ, the Righteous One.”- 1 John 2:1 NIV
So there is a difference between committing a sin and dealing with it before God and continuing to live in known, unrepented sin as a way of life.
Paul asks the same question:
“Shall we go on sinning so that grace may increase? By no means! We are those who have died to sin; how can we live in it any longer?" Romans 6:1–2 NIV
The new birth changes our relationship with sin. We may stumble, we may fail, and we may transgress God's will, but the believer should not make peace with sin. The Holy Spirit brings conviction, leading us to confession and repentance.
This is why I would be cautious about saying simply, “It is normal for Christians to sin every day.” If that means we are still capable of sinning every day, Scripture supports our need for ongoing confession and dependence upon Christ. If it means Christians are expected to remain in habitual, unrepented sin because freedom from sin is impossible, Scripture does not support that.
John is particularly strong on this point: “No one who lives in him keeps on sinning. No one who continues to sin has either seen him or known him.” - 1 John 3:6 NIV
That does not mean Christians achieve sinless perfection. It means that continuing in sin cannot be treated as the normal Christian way of life.
I think the problem develops when God's grace is separated from repentance and sanctification. Grace is not permission to remain in sin. Grace teaches us to turn away from ungodliness: “It teaches us to say ‘No’ to ungodliness and worldly passions and to live self-controlled, upright, and godly lives in this present age.” - Titus 2:12
So yes, Christians can sin. But there is a significant biblical difference between a believer who sins and repents and a person who deliberately continues in sin without repentance.
The goal of salvation is not merely that we are forgiven every time we sin. It is that we are being transformed into the likeness of Christ and increasingly freed from the power and practice of sin.
