Yes, that's true
They were going against the orthodoxy of the church Sanhedrin
yes, they did as did Jesus
. They didn't fit it. They were radicals. -- they were not radicals per se, but their concept of the Messiah didn't fit with the Sadducees or Pharisees. however it did resonate with the people
That's the main reason there weren't many Jewish Christians left. -- but that's my point, there WERE many Jewish Christians - that's why the Jesus-movement was a threat right until 132 AD
Well again it was a threat ONLY because it looked too Jewish. As soon as enough people abandoned the outward signs that made them look too much like Jews the Roman government was okay with it. Anti-semitism was so deeply ingrained into Rome that it followed was a strong force in the early history of protestants today.