[Antoninus]

You only need to go back step by step and see who Rome slaughtered for teaching truth.

Funny--we're talking about Purgatory and Gregory the Great and all you've got is a reference to Black Legend-style persecution tales of the Waldensians (who, btw, even modern Protestants would consider heretics with strange doctrines). Or do you believe that the Waldensians are of apostolic origins being founded by Saint Paul or Saint John the Baptist as they taught?

[aMorePerfectUnion]

btw, even modern Protestants would consider heretics with strange doctrines

Today, sadly, they have slipped into liberal heresy. During their first many hundred years leading to their slaughter by Catholics, this was not so. Those original doctrines would almost entirely be supported today by evangelicals.

to Black Legend-style persecution tales of the Waldensians

It both happened and was apologized for by a pope.

Or do you believe that the Waldensians are of apostolic origins being founded by Saint Paul or Saint John the Baptist as they taught?

What the Waldensians believed was apostolic. What Rome teaches today is not.