The Inquisition and Reformation proves that to be a bad theory. If the Protestants hadn't broken away from the RCC, most of us would be dead today... instead of looking back and seeing most of their families decimated by dogma which doesn't survive the light of day.
Having had a number of discussions about how to be born from above... I'd have to say you're... very optimistic, regarding what people believe.
Revelation 2 and Revelation 3.
One of those churches was called a church in name only. One church allowed Jezebel to teach them. One had false apostles and exposed them. One is the church of the open door. One was tested by the devil. One is called the seat of Satan. One left Jesus standing outside the door.
Jesus is The First Protestant.
Revelation 22:16
Ἐγὼ Ἰησοῦς ἔπεμψα τὸν ἄγγελόν μου μαρτυρῆσαι ὑμῖν ταῦτα ἐπὶ ταῖς ἐκκλησίαις
I Jesus have sent Mine angel to testify unto you these things in the churches.KJV
epi = a primary preposition; properly, meaning superimposition (of time, place, order, etc.), as a relation of distribution (with the genitive case), i.e. over, upon, etc.; of rest (with the dative case) at, on, etc.; of direction (with the accusative case) towards, upon, etc.:--about (the times), above, after, against, among, as long as (touching), at, beside, X have charge of, (be-, (where-))fore, in (a place, as much as, the time of, -to), (because) of, (up-)on (behalf of), over, (by, for) the space of, through(-out), (un-)to(-ward), with. In compounds it retains essentially the same import, at, upon, etc. (literally or figuratively).--Strong's