I'm not seeing any analogy between the two things. Could you explain why you say they are analogous?
They are both terms not found in Scripture but which are true anyway.
But you do call something "Roman Catholicism":
The Church Jesus and His Apostles founded.
You wouldn't? Yet you do.
I gave my reasons why. It's for clarification, identification, definition purposes.
But you do call something "Roman Catholicism". Are you not calling an -ism "Roman Catholicism"?
I am. But I wouldn't call it an ism if I had my druthers, but I don't, because there is confusion now that didn't exist previously.
So, you are not calling an -ism "Roman Catholicism"? Or, instead, do you mean that you are calling an -ism "Roman Catholicism", but that you would just as soon not be doing so?
The latter.
Did Christ say He will build whatever it is you are calling "Roman Catholicism"?
Yes, but He didn't use that term. He used "Church".
On the contrary, denying the proposition, P, is in no way a branch of affirming P. Your response to that question is as ridiculous as it would be to say that denying that the sky is blue is a branch of affirming that the sky is blue.
OK taking your analogy. Say there was a time before anybody ever said or thought or believed that the sky is blue. Fair. Now one day someone founds the school of thought which affirms that the sky is blue. Never seen before that day, never thought, never said. Brand new.
Now later on, there exists a group which began as that school of thought, and before, there was never anybody who said otherwise, there were those who said and thought nothing about whether the sky is blue, and then, there emerged a group of people who said, contra the O.G. group which lived by and believed and taught and said the sky is blue, that the sky is NOT blue.
Without that first group or movement or school of thought, this second group, who denied the sky is blue, wouldn't have any reason to exist at all, since they live to contradict the first group. So the second group exists contingently. Without the first group, the second group doesn't exist, since it would have no reason to exist. They exist in opposition to the first group.
In this way even those who actively live to deny the sky is blue, they are a branch of the first group, because the first group was founded in order to say that the sky is blue. Before them, nobody said anything at all about the color of the sky. So the second group, the blue-sky-deniers, contingently exist, contingent upon the existence of the first group or school of thought.
Even if the school which says the sky is blue entirely died out, such that literally nobody ever said the sky is blue anymore, even still, history testifies that the second group of blue-sky-deniers developed out of the group which originally said the sky is blue.
Wow! Since, according to you, "to follow and believe in Jesus" is (is it not?) to believe [bread] stops being [bread] and starts being Jesus, what you've just handed us is this: "Because you all (people who deny [bread] stops being [bread] and starts being Jesus) claim to [believe [bread] stops being [bread] and starts being Jesus]." Are you serious? People who deny Rome's doctrine of Transubstantiation
Note that "transubstantiation" is a particular theology of the Eucharist which does not obtain and is not taught or believed by all ancient branches of the Church which Jesus and His Apostles founded. But the Real Presence of Jesus in the Eucharist is believed and taught by them all.
, claim to believe Rome's doctrine of Transubstantiation?
No. But before anybody ever said the sky's NOT blue, someone said that it IS blue. The branch of Christian tradition which denies the Real Presence would not exist without the O.G. Church, who does and did believe in the Real Presence.
It's certainly not Christian to call unitarian heretics such as JWs, "Christians"
I didn't call them Christians. I called them a branch of Christian tradition.
, or to call their Russellite heresy, "Christian" or "Christianity". Doing things of that sort is a feature of Romish false ecumenism.
We don't believe Arians are Christians, just like how the Apostles did not believe the Judaizers in the first century were Christians either, they believed in and promoted a false Gospel.
Um, God's authority. Beside God's authority, what else would you even think to call "divine authority"?
Then elaborate. Authority can mean different things. It can mean authoritative, like canonical, and it can also mean a power, ability, right, etc. I took you to be saying the pope wields divine power, and I was asking you, which power? So if you meant something like authoritative or canonical, then let me know.