It is what I recall from the lectures on heresies, from many decades ago, by the sainted (or should be sainted) Brother Victor, our teacher in the Christian Brothers seminars. I was at one time recruited for that august order, though I proved to myself I was thoroughly unsuitable!
Basically, a heretic is a heretic, and as far as we are concerned he might as well be a Buddhist. They are no better or worse, and are just as likely to go to hell for unbelief, though I gather we have let up quite a bit on that last part.
As for the “special” case with Mormons, I gather its a recent tiff in retaliation for the business of retroactive baptisms. At this rate we will have to disinvite them from the bingo, take that !
I didn't expect you to mock the Pope, and the Catholic church and it's faith.
You really are just making up things as you go.