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>> “All the speculation about some hidden strain of Protestantism that existed from the time of Christ...” <<
No, not Protestantism, as there was nothing to protest until the 4th century when Roman catholicism was invented by Eusebius and Constantine.
It was the faith of the Netzer, Yeshua: the Netzerim.
That is what is plainly described in The Acts. They carefully, and completely followed Torah, and sought to teach it to the new Hebrew believers that had been separated from the true worship for centuries.
Literally everything in The Acts is Torah centered. That is the faith of Yeshua.
That is what the apostles taught, and the total reason John penned his first epistle.
Protestantism is just catholics protesting catholicism. They’re both man made at their foundation.
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That’s a lot to assert with no supporting documentation.
“Phariseeism is a man made religion, just as Catholicism is.”
Gosh, that makes Roodism man made bilgesludge.
“They’re both man made at their foundation.”
Like, say, the #fakerabbi Michael Rood.
He’s a con man too, but that’s another topic.