I think we are at the point where we have to admit to what is the case here.
We are not engaged in any discussion about the Papal claims, although that is what the thread is supposed to be about. Jack has been merely trying out the stuff he'd learned in Inquirer's Class on the rest of us, confident that all non-Catholics are just ignorant or willfully heretical. That's what he was taught, after all, and he's eager to believe it so.
We have an inexperienced person who recently joined a faith he'd known little about previously. He uncritically drank in everything that was told him and, not having been a well-trained member of his previous church, he can't see anything but what he's been told most recently, including the fact that it can't be wrong. He knows little of Church history or practice, and he approaches scripture exclusively on the basis of what his church tells him it says.
Despite that, we might have hoped that he'd at least be willing to discuss the subject of this thread. After all, that was his request to us.
Because, however, he is afraid to do so lest it threaten his confidence in every last thing he's been taught, it's pointless for us to go further.
As we know, there are Catholics, clergy even, who can see the human failings in every church, the warts along with the glories in every denomination, and still favor the Church of Rome on balance. That's not the case with the new and true blue convert for whom it's all been made so simple.