The difference is that God didn't personally assure us that the Gates of Hell will not prevail against our country.
Biden is certainly not president of anything, for sure, but Francis is Pope and the only other option is "Catholicism was fake and gay this whole time". There is no Catholic option to reject Pope Francis.
In the same way, we can say "there is no President" and we wouldn't be wrong.
The difference is that God didn't personally assure us that the Gates of Hell will not prevail against our country.
Biden is certainly not president of anything, for sure, but Francis is Pope and the only other option is "Catholicism was fake and gay this whole time". There is no Catholic option to reject Pope Francis.