Quoting Litekeeper, who says it better than I:
“And that, in a nutshell, is the crux of the argument. Christianity is based on historical figures involved in historical events in real space and time. It is not based on philosophical speculation, nor on fantasy, but on history.”
There may be some independent evidence for Jesus being an historical figure but his divinity is pure hypothesis.
It’s a history of believer in a hypothetical system of belief. Overlaying the existence of demonstrably existent historical facts and people onto a base of hypothetical belief doesn’t change the hypothetical foundation of the belief.