What the mythical figure of Jesus said is what writers of the following centuries wanted him to say. There’s historical evidence of floods, but I doubt the average person in 30AD would know about them. Can you give me a source on that? Also, a source of him talking about the Apocalypse?

We’re speaking purely of the historical figure, who preached a new religion that offended both the Jews (of which he was one) and the Romans. Everything that was written afterwards in some silly holy book is unreliable and tainted.