Same source etc, but different religions ?

[Lek]

You don't have to shout "wrong". Just tell me why I'm wrong.

Many, if not most of the early, First Century Christians came from 'Gentile' people who had divergent beliefs and often worshiped various gods. They had no interest in Jewish customs, which is why Christianity appealed to them.

True. But the first Christians, including Jesus and apostles were ethnic and religious Jews. They had been raised up in the Jewish faith and culture and had been anticipating the messiah.