Quote: Why do you think Christianity spread so quickly and so far despite no "first hand" contemporary sources for such huge events?
It did not spread quickly, dummy. That is more of the tale invented by con men to (successfully) fool assholes like you.
Scholars, ( i.e. people who actually something, not to be confused with bemused morons like you) estimate a xtian population of between 5 and 10% by the 4th century and that mainly in the East. Xtianity only grew after a) Constantine de-criminalized it and b) after Theodosius started persecuting pagans in its name.