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You know Praeter, this is not fun and games. This is the most serious topic that anyone on this Earth could discuss. You treat it with such nonchalance that I’m embarrassed for you.

I wasn't treating it with nonchalance, and I meant what I said.  Sedevacantists are most certainly not Catholics.  One of the errors of the Traditional movement has been treating sedevacantism as nothing but an opinion.  It may have seemed like that at one time, but the consequences show how false that notion was.   Sedevacantism is a heresy, and the sedevacantist heretics are amongst the worst enemies of the Catholic Church today.   You and I are not in the same Church.  We have two different religions, and yours is false.  

I wasn't treating it with nonchalance, and I meant what I said.  Sedevacantists are most certainly not Catholics.  One of the errors of the Traditional movement has been treating sedevacantism as nothing but an opinion.  It may have seemed like that at one time, but the consequences show how false that notion was.   Sedevacantism is a heresy, and the sedevacantist heretics are amongst the worst enemies of the Catholic Church today.   You and I are not in the same Church.  We have two different religions, and yours is false.  

Wait, how is it heresy?  According to this source: http://www.the-pope.com/theolnotes.html  Even in ordinary times rejection of the clear papal claimant is *error* not heresy...

I'm curious what you think of various positions on the spectrum.  For instance, I believe that we should presume that Francis is a real pope, and act accordingly, I think that's most likely and safest, but I do conclude the *possibility* that the Church *might* eventually tell us he's an imposter.  Do you believe I'm outside the Church for that reason?

I think also there are two separate issues here.  Whether the identity of the papal claimant is currently a dogmatic fact, and also what is to be done about those who err in good faith about the question.  Given that Archbishop Lefebvre certainly wavered here, and I think everyone here would agree he was a good (though not perfect) Catholic, I have a really hard time believing that error in good faith is an automatic ticket to Hell.  Now I will grant I think its pretty reckless to go the more extreme sededoubtist or especially dogmatic sedevacantist routes, but I'm still content leaving the judgment of such souls to God, who is merciful and desires all men to be saved.