Tell me about this Josephus. When did he live? Do you have access to an original edition of his writings? Is his "testimony" uncontested by people who study such things? In short, is his testimony RELIABLE?
When I was a Dub-kinder, growing up in the nurturing environment of the local Kingdom Hall, the name of Josephus was invoked by adults in the congregation as if it were a magical spell: "There this JEW, named Josephus, who lived long ago, and HE says there was a guy named Jesus who did great things, so, see -- the Watchtower bible and Tract Society has the truth. There's no reason a JEW would talk about Jesus unless he was REAL"
That is one awfully big leap of faith you're making; one that Evel Knievel himslf wouldn't be willing to make in a rocket-propelled motocycle.
Josephus is not the magical key you might have been (mis)lead into thinking he is.
The fact is that there are no original manuscripts available today that were written by Josephus. The versions of Josephus' work that we have today are the result of a long iteration of copies of copies, and those copies were performed by - who? - yes, catholic priests, wh *might* not have been above "fixing" Josephus' works to harmonize with what the catholics were selling. Some have suggested that all of what Josephus said about Jesus is a complete fabrication with Josephus' name attached to it.
You can believe whatever you want.
For my money, anything Josephus "said" is as reliable as anything Aesop said, except that Aesop was honest and tells us these are FABLES.
There's no reason a JEW would talk about Jesus unless he was REAL, unless what the JEW said was actually written after his death by catholic scribes.