No Catholic can deny that Christ is the head of the Church, but this is exactly what Protestants say in order to demean the papacy. You and they (the Protestants) NEED to destroy the holy office of the papacy in order to reconcile what you and they believe is the correct way Christ established His Church.
Prots believe we worship Mary too, they also believe, like sedes, that we're supposed to obey the pope blindly - that is, until popes say something that destroys or threatens sedeism, then it only applies when the pope is the pope.
Don't tell me what prots believe, I don't care. The dogma states it is absolutely necessary for the salvation of every human creature to be subject to the pope, period. Sedes conveniently add the disclaimer that the dogma is dependent up whether we believe he's the pope or not - just as if that is something they can do - because the pope is not the pope of course. Good luck with that, I truly hope it works, I really do.
The pope is not the head of the Church, accept that.
Those who follow these heretical popes into perdition, do so of their own free will - just as you would have were it not for the grace of God you corresponded to, accept that.
The graces that you accepted, the whole rest of the NO world willfully rejected and still reject, and will reject - of their own free will, accept that.
No pope/non-pope/heretical usurper pope with all the heretical NO bishops, cardinals and priests are able to destroy the Church, not even were it to go on for 10000 years if this world lasts that long, any more than they could destroy Christ.
If, God forbid, you do not make it to heaven, it will not be because heretics have sat in the Chair.