Hogwash. Even if Jesus existed, Paul didn’t know him because he latched onto the ideas after Jesus was dead. All he did was introduce his own crackpot views and attach them to what the other guys remembered or made up.
He didn’t know Jesus but there is evidence that he knew his brother James and may have gotten some first hand info from him. Be that as it may, Paul virtually created modern xtianity by branching out from the original Jewish Jesus to create a deity for the masses of Roman citizens and clients in the empire. he also changed the whole concept of a Jewish interpretation of sin to expand it as all encompassing instead of the old testament idea of original sin. It was later redefined by Origin and topped off by Augustine. Both of the latter knew that Jesus wasn’t coming back anytime soon so they had to harness the faithful with a new and improved version of sin against god/the church by piggybacking their ideas on Paul’s letters. Bottom line: sin evolved from a kind of Jewish OCD behavior to keep the people from straying from Yawyeh. Anachronistic beliefs have little place in modern society. It’s ok to eat pork and covet without fear of reprisals or rewards from skydaddy.