Well, I guess were down to John 3:16.
Not really. Since Catholics don't believe that we are saved by Grace alone through Faith alone, they don't really buy into the whole John 3:16 thing.
I think the only verse that Catholics truly consider inerrant is the one that they insist says that Peter is the Rock upon which the Church is built. Of course it doesn't really say that, but then they believe their interpretation of that verse is more inerrant than the verse itself.
“Well, I guess were down to John 3:16.”
That was not for everyone. See, that was only for a cowardly, questioning, male Pharisee whose “world” was only the orthodox, self-righteous Jews. Every one outside Israel are as nothing, worthless dogs; nada!! So, John 3:16 is only applicable if you are part of the circumcised elect.