You wrote:
“When Paul preached to the Gentiles, they were founding new churches sometimes decades after Christ, and what Paul taught wasn’t what Christ taught.”
Nonsense. Paul taught what Christ taught and that’s what his claim was too. Also, he established no new Churches, only churches.
“So if a modern day Paul were to teach the same things the original Paul taught with the same results, then would those new churches be discounted by you since they came about 2000 years after Christ?”
New Churches should always be discounted.
Sense.
Show me where Christ taught of the mystery of One Body or the Church Of Christ or salvation by grace.
Now show me where Paul taught those topics.
See, there's a difference.
Although each group was a new group, they were all part of the Church of Christ.
But each one had different needs and applications of the same truths. They were similar yet different.