Brain, I'm doing a little research, but I'm having a tough time finding an objective or unbiased reference. The Messianics have their version. Christians have their own, but their's is somewhat ambiguous in the very early years - maybe intentionally so. Although the Messianic history seems more complete and less ambiguous, their distain for Christianity is evident too. So - I don't know how reliable any of the history is.
It seems that although the earliest followers were Jews, the movement grew among non-Jews too. From very early on there seems to be a rift between the Jewish and non-Jewish followers, mainly dealing with the "Jewishness" of the faith. The Romans and other non-Jews were unwilling to accept the Hebrew tradition and the "official" split didn't occur until the 4th Century. The split occurs with the "Council of Nicea", where it is said Jesus's divinity is "officially" stated - or something like that. My internet search came up with Christian writings but not before mid-second century - or so.
Regardless, it's hard to believe the actual NT writings were not altered or changed due to interpretation, or translation, etc - especially given the early angst between Jews and non-Jews.