You can be fully forgiven and still be a work in progress. Both are true at once.

Being accepted and being finished are not the same condition. People assume that if they were truly forgiven they would stop needing it, so every repeat of the old habit reads as proof the first part never happened. Those two can sit side by side without contradicting each other. You can be fully welcome and still clearly unfinished, and most people you admire are living in exactly that arrangement.

The next time you slip this week, resist the urge to re-open the whole question of whether you belong. Deal with the specific thing, then carry on from where you are.