Debating the existence of Jesus

[Godscreated]

I'm currently in a debate with a theist over whether or not Jesus existed.

Points he's made so far:
-Modern scholars agree Jesus existed, so he existed
-Tacticus and Josephus are reliable historians, so we should accept their accounts of Jesus.
-The writers of the Gospel died in very gruesome, martyr-like ways, so why would they die for something that wasn't even true?

Points I've made:
-Tacticus and Josephus were born AFTER the events of Jesus allegedly occurred, making their accounts as reliable as the Gospels (not very reliable)
-Josephus' account of Jesus was written after the first gospel was written.
-Josephus' "Testimonium Flavianum" was tampered with.
-Josephus' 'Jamesian Reference" refers to a different Jesus than Jesus Christ



So I've debunked his first two points (even though he won't acknowledge I have), but he keeps flaunting that third point of his. Any recommendations on how to end this debate in my favor, whether it be debunking the third point or addressing a new point?

Is winning all that's important to you, I thought a debate was about getting to the truth of a matter.
Just because Josephus was born a few years after Christ's death rules him out as a reliable source.
Well if that's the case then my being born 9 years after WWII means I know nothing about it. Even though I had uncles who fought in the war, a mother and father who lived through the war, many of their friends who fought in the war and many of my friends who's parents were in the war. Crap and here I thought I had reliable sources, I bet the history books that were written after the war are trash too.