>>This narrows such candidates to the Catholic and Orthodox churches already.<<<p
No, it does not. It’s only by the words of those organizations that they believe themselves to be the interpreters of scripture. Scripture itself show them to be wrong. Scripture says that all true believers have the Holy Spirit as a teacher and counsellor. That and the fact that the Catholic Church relies on proven spurious documentation is cause enough to regard them in error. Add to that the belief in the assumption of Mary which didn’t even surface until 100s of years after the passing of the apostles and it’s easy to see they are NOT the “church” Christ was talking about.
Cynical Bear's interpretation of Scripture itself show them to be wrong.
Fixed it for you. You're welcome.