The Relationship Between Judaism and Christianity

[nili]

Sorry. Ignatius of Antioch.

Oh! Possibly, but I don't know enough about him to say. From what I HAVE read of his works, it's clear that he wasn't a Jew and was probably a convert from a pagan faith; because at the time, the earliest followers who still considered themselves Jewish would have insisted on following the Torah and the rabbis while he said you didn't have to.

What we seem to know with some degree of confidence is that Ignatius saw Jesus as deity, which suggests that nascent trinitarianism may well have been promulgated prior to 107 C.E., i.e., within half a century of Paul's missionary work. This seems at odds with your view that "The teaching of the Trinity isn't something that developed until way later."

Parenthetically, when talking about this period care should be taken to avoid conflating Judaism and Rabbinic Judaism. It's also useful to remember that much of what's 'known' about the Ebionites and Nazarenes is derivative and speculative.