Question

If Confucius died 400 years before christ was born which means no Christianity why were his last words were "I lived as a philosopher and died a christian"

Answer 1

You have the wrong person

Those last words were attributed to Giacomo Casanova, not Confucius

https://www.radio.cz/en/section/panorama/casanova-the-world-class-lover-who-died-a-second-rate-librarian-in-bohemia

Answer 2

Welp just shows how unreliable the world can be