You are cherry picking - dismissing the entire concept of regeneration and grace. That’s a stretch to think the “go and sin no more” backs up your case. It does not.
When one takes a wedding vow to “... love and honor ... for better or worse ... until death do us part”, is that an actual vow or is it just a set of lines one reads, like the elementary-school Thanksgiving Pageant, for ornamental purposes only?