Try not to look at the righteousness of God that Christ appropriated for us on the cross as a 'can of worms'.
So if a person is saved but they purposely turn away (there are some people who believe, see that nothing is happening right away or going their way because they erroneously think that believing equates to an easy life, and then stop believing!) and they die. Are they still saved? That question is the 'can' and the 'worms' are the debating viewpoints that are sure to follow now that I've 'opened' the 'can.'
One of the 'worms' is that of like parents and a child, the parents will continue to love the child and therefore the child will still be saved (prodigal son, Hosea, David).
The other 'worm' is that the parents love the child, the child continuously turns away, and finally, God gives up and lets the child do their own thing and turns His face from the child (Egyptians, Assyrians, Babylonians).
I don't know if there are anymore 'worms.' It's like arguing if 'x' should be used to replace "Christ," if we should all capitalize 'Bible' which some people do not always do even here at CC, or even if we should leave out the 'o' in 'God' to show respect. While I appreciate that you don't like theology to be compared to cans and worms, I'm going to treat 'can of worms' as a commonly used figure of speech that's perfectly valid for a forum post exposition.