I remember that thread. They claimed to land in Florida (I think)somewhere and about the first thing they did was burn some people alive for heresy. I'm not sure that's one they ought to be pointing at and beating their chest over. But that's just me.
This thread is clearly not the one we’re thinking of, but it IS evidence that they’ve been pulling that stunt before. It’s from 2009.
Book Review: Discovering a Lost Heritage: The Catholic Origins of America
http://www.freerepublic.com/focus/religion/2330687/posts