Since I'm more familiar or acquainted with Christian teachings than others, like from Judaism or Islam (though Muslims & Jews probably feel the way about this subject), or non-Abrahamic religions, I'll approach this topic from this (Christian) angle, but anyone can contribute and put non-Christian perspectives if they like.
One of the Christian teachings is the church urge people to REPENT.
Repenting seemed as essential as believing (in god & Jesus) or converting, or baptizing.
What happens if you're devout and done no wrong?
What happen then?
Do you still repent if there are nothing to repent about?
If yes, then what is the purpose of repenting for things you haven't done?
Or is it just custom, like praying certain number of times or at specific times?
It's my understanding that you would only repent or atone should you commit wrongdoing (or sin). So repenting or atoning for nothing would seem terribly illogical.