IMO, Purgatory is the perfect example of someone who believes that Christ's sacrifice was not enough to cleanse them of their sins while here on earth. The Bible makes no distinction between mortal sin and venial sin.
Paul doesn't say, "...for some have committed venial sins and fall short of the glory of God but others have committed mortal sins and REALLY fall short of the glory of God therefore the sacrifice of Christ wasn't enough therefore after you physically die, we'll all get together and pray for your soul and pay something to the local priest...THEN...the gift of God is eternal life through all this."
At least, that's not what my Bible says...I'm just saying...
Of course, if we changed translations and twisted and left out words, and took it completely out of context, we can make it say anything, now can't we?
In Christ...Alone!
Wiley - YIKES! Another RCC minefield - with little foundation, stretched to beyond reason.