No that’s your reasoning if you start from the Protestant point of view. The Church exists since before the New testament. Beleif in it is a matter of faith. The fact is none of its doctrines are in conflict with the new Testament it authored. It’s only protestants that think the Bible proves itself.
Elsie posted: The bible is true because the church says so. The church is true because the bible says so. ad nauseum
The Church exists since before the New testament.
And AFTER the OT.
Evidently Cuban wants it from the CATHOLIC point of view. The church is true because the bible says so. The bible is true because the church says so.