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

Christians ought not habitually sin. However, Christ’s atoning sacrifice has covered all of our unintentional, ignorant, and momentary sins, so we are still forgiven from the outset.