I agree with Clare.
Don't ignore the context. The historical context of the situation. A historical context in which a long lived civilization which has been occupied by a foreign civilization with different beliefs, as well as a number before that, a minority sect establishes itself to initiate a faith that says no matter the occupier on this world it is the other world that matters.
And to address pot-kettles point, yes, non-Jews adopted Christianity but guess what.......that was part of the point. I leave theologians like Daddy-O to discuss the full theology of that with Paul but there were many sects at that time looking outside the traditional Judaism and looking for something else. That the fact that the basics of Christianity spread pretty far into non-Jewish cultures prior to Constantine establishing Rome as a Christian nation, with many opposing such a notion and tried to revert it, there is a lot of historical evidence that the Christian sect spread far and wide without the notions that many members of this forum think it required which was the heavy handed use of an established national power.
Which means there is something to the story of Christ. Even if someone comes on here and says what about the Mithras sect or Horus the fact remains that Christianity, the story of Jesus, had made into Germania by the 3rd century and had enough of effect that the Vandals who sacked what they thought was an apostate Rome for adhering to the trinity that theology of this of Christianity had spread fairly well.