When since did God appoint these bible belt evangelicals to decide who's going to heaven?
I don't live in the Bible belt, but I've never met a Christian that said all Catholics are going to hell. If I did, I'd doubt he really understood his faith.
Catholics have some beliefs I disagree with, but no fair minded student of the scripture can say that they are for certain going to hell. That's just judgemental, legalistic nonsense.
I recall when I was young the uproar that occured when Pat Boone joined the "Charismatic movement" that includes speaking in tongues, faith healing, etc. There were books published by the Church of Christ saying he was no better than a Catholic in his godlessness. They didn't mention Mormons, but then I don't think Mormons were on anybody's radar back then.