yeah, catholics believe we can confess sins to clergy, do penance, and be forgiven by god / jesus / mary. but you left out a lot of info. about sin. there are different types of sin. a mortal sin possibly is unforgivable. also, you make it seem as though catholics confess their sins, so they have a clear conscience to commit new sins. most clergy wouldn't allow that. shame and guilt are a main part of catholicism, especially confession. if a person commits an unforgivable sin, or many sins, they could be ex-communicated.
The system of micro-managing guilt, atonement, and forgiveness can have beneficial effects when used with good intent. In history, however, there have also been negative outliers when the system was misused for political purposes. The famous letters of indulgence were an example of how not to do it.
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