Religion - Reconciliation, What is the Real Purpose?

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One of my friend introduced me to join her religion, which she told me reconciliation (sin admitting) is one of their sacraments. What I believed in my sight, reconciliation is the way to heal and to gain back spirit motivation which had been troubled for the some times. What I disagreed is the way she describe Reconciliation is a "sin cleaning" process. Sin cleaning is not appropriate word and very false in the description to me. But she still persisted in her perceptive. Then I asked her, if I slap you now (example), then I go to what you said sin cleaning, I don't had a sin anymore, tomorrow I will hit you, then I go for sin cleaning again and again. She can't answer the point of my question, instead of taking me the explanation to elsewhere which had no connection at all. I had tried to explain to her my opinion about this. But she still took me in wrong perspective. I told her, to analyze an abstract world, you will need to use your heart as your eyes, do not swallow in a piece, chew it, use your feeling (to me it's more like your six sense). Am I right at this point? I'm still did not know, that's why I want to gain any resources I can from MyLotters in here. Can you describe to me, what is purpose of Reconciliation?