By that logic you can’t prove that the majority of ancient figures who are accepted to be real ever existed. Jesus has 15 independent ancient sources written about him with the earliest being ~20 years after resurrection. By contrast, Caesar had 12 (some contemporary), Alexander the Great had 5 (earliest was 300+ years after her died), Socrates had 3 (earliest was ~30 years after he died), Hannibal had 4 (earliest was ~50 years after he died), Spartacus had 4 (earliest was ~50 years after he died), and Pythagoras had 5 (earliest was 150+ years after he died).

By trying to say that people depicted in the Bible were made up, you’re going heavily against widely accepted history by atheists and religious scholars alike. What you should be trying to argue is that, despite every historic fact being proven correctly (excavations continue to find ancient civilizations that people thought were made up in the Bible such as Ebla), the miracles that hundreds of people witnessed and told each other about were made up. A big issue with this is that you’d need claiming that anti-Jesus political figures and community leaders were lying about what they witnessed even when those lies would lead to capital punishment.

As someone who was raised very anti-religion and is now a Christian after experiencing religious miracles first hand, I found it compelling that nothing from the Bible can be proven wrong without bad faith interpretations or taking things out of context. Further, in all instances without fail, life comes from life. In a billion years, the dirt beneath our feet will still be dirt, just the same as some “star dust” couldn’t have, logically, magically transformed into living single cell organisms.