I have to say, though, that these passages:
“Making yourself feel bad for what you do wrong is “self-made religion” because the pain we feel seems to justify our wrongdoing.”
“Condemning ourselves after we have done something wrong gives us a false sense of being “good” again.”
...describe something that is entirely foreign to my experience and contrary to common sense. How could regret for one’s sins make one feel “good again?”
Some feel the need to pay the price for their sins somehow. I don't think it's the regret that makes them feel good again, but some satisfaction afterward that they "paid" their debt.
Of course when the wages of sin are death, they'll never truly get there unless they accept Christ's atonement for their sin.