His belief or the RC church's dogma does not rescind Jesus's payment for my (or anyone else's) sin.
From my perspective, I liken the RC's strictness to the issues that Paul had with churches that struggled with a serious problem: Whether or not it was OK to eat meat that had been sacrificed to idols. Paul's answer: it's OK to eat the meat because it has no power over you but the real issue was whether or not the eating of the meat would violate the other believer's conscience and cause them to stumble. He said not to use your freedom as a pretext to stumble another believer.
In the same way, I will not pick a fight with RC's on this issue because it doesn't harm my salvation in any way.
So, I'll ignore Mel's pronouncements, concentrate on the positive of the "Passion" and look for things in common with the RC's instead of the differences.
Are Catholics not disciples of Jesus, or is that a name of a denomination?