"his first mention in the writing of Josephus is a fairly obvious forgery, it being neither in his tone or style of writing, and added into a margin"
I'm no historian, but it sounds like you aren't either? Wikiped says >.
There's also: "Scholars generally view these variations as indications that the Josephus passages are not interpolations, for a Christian interpolator would have made them correspond to the New Testament accounts, not differ from them"
Now, you might be 100% right that it is all a pile of lies, etc. But if modern scholarship has almost universally acknowledge the authenticity of a "fairly obvious forgery" you might need to expand your case a bit.