Hopefully making theology simpler to understand! (2 Corinthians 1:12)

My little children, I am writing these things to you so that you may not sin. But if anyone does sin, we have an advocate with the Father, Jesus Christ the righteous. He is the propitiation for our sins, and not for ours only but also for the sins of the whole world.
1 John 2:1‭-‬2, ESV

As Christians, we should be sinning less as we grow closer to Christ. Yet, we still live in a fallen world in sin-corrupted bodies. We will still sin, but Christ’s atonement covers even these sins, always and forever.