We should remember, there are the patron saints of animal topics, the patron saints of actors, of airline stewardress, of ammunition workers, of bell makers, of box makers, of boot blacks (not prayed too to much these days I suspect). There are the patron saints of bladder diseases, of blisters, of bowel disorders, of dandruff, of fainting. There are the patron saints of catepillars (not the tractors), dog bites, insect bites, patron saints of bees and, of course, bee keepers (one must have equal time).
It is understandable why our Catholic friends would laugh at a "church of one". They simply must love a party. After all, one can tell who prays to the saint of dandruff by whether they have telltale white flakes on their coats.
The RC polemic really is an attempt to negate the validity of any Scriptural challenge to her, as she is akin but more extreme than what it condemns, being the outworking of a premise that it alone is assuredly infallible, that according to her interpretation only her interpretation is correct in any conflict, but which is not the basis for the establishment of truth and the church, whih actually began in dissent from those who likewise presumed of themselves morr than what it written.
Meanwhile, most of what constitutes Rome have their own version of Catholicism, and whom Rome counts, treats and buries as members.