Bringing up Josephus's references to Jesus is problematic on any number of fronts.
First, Josephus wasn't a contemporary of Jesus, so his writings are based on "hearsay".
There is a question of authenticity of attributing the passages in question to Josephus.
Then there is the question of translation errors, and/or later textual additions by Christians,
as surviving copies of Antiquities of the Jews date from the 11th century as copied by Medieval Christian Monks.
If one accepts those copies as valid, then there is the question of whether Josephus was truly "non-Christian".
3.3 Now there was about this time Jesus, a wise man, if it be lawful to call him a man; for he was a doer of wonderful works, a teacher of such men as receive the truth with pleasure. He drew over to him both many of the Jews and many of the Gentiles. He was [the] Christ. And when Pilate, at the suggestion of the principal men amongst us, had condemned him to the cross, those that loved him at the first did not forsake him; for he appeared to them alive again the third day; as the divine prophets had foretold these and ten thousand other wonderful things concerning him. And the tribe of Christians, so named from him, are not extinct at this day.
There is a second reference by Josephus to Jesus as the brother of James. But given that it also occurs in
Antiquities of the Jews it has the same problems as the first.
So, sorry
DOC, but Josephus doesn't qualify as evidence for the veracity of the NT authors.
GB