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firstly christ is a titlr it simple means anoited one wgich means leader. everyone who was a leader of some religious or other griup would have been called leader. the same goes for jesus which just means saviour another very appropriate title for someone who would save his ppl from the romans. the jews wanted a saviour of tht type the prob is jesus didnt do that. there are many messiahs in the bible, every king or priest was a messiah.
lastly give josephus family were high priests it stands to reason his vdry own dad would have told his historically interested son of a man who cured the sick, raised the dead et . josephus was born only four years after jesus death. the line you mention doesnt identify jesus of nazareth it simply saus chrestus. chrestus means something different from christ. look up the word on wiki. given all of jesus wonderous ministry how is it josephus only wrote down one line? how is it he didnt write up a gospel ?he wrote encyclopedias of the jews and their history...he wasnt shy of a good writeup.