1. Biased Sources
Those who wrote the NT documents were "believers" and therefore biased. These texts are not historical documents but articles of faith.
Everyone is biased. A lawyer building a case is biased in favor of his client, but that does not invalidate the evidence.
What accounts for the particular "faith" of these early disciples and the rise of early Christianity? Why were they willing to die for this faith?
Though they may have thought they saw ...